2008—2009苏教版八年级数学期末试卷 苏教版八年级下册数学期末试卷

2008~2009\u5e74\u82cf\u6559\u7248\u4e94\u5e74\u7ea7\u4e0a\u5b66\u671f\u671f\u672b\u8bd5\u5377\u6570\u5b66

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D\uff0e50\u00b0\u621680\u00b0 7\uff0e\u4f7f\u4e24\u4e2a\u76f4\u89d2\u4e09\u89d2\u5f62\u5168\u7b49\u7684\u6761\u4ef6\u662f ( ) A\uff0e\u4e00\u9510\u89d2\u5bf9\u5e94\u76f8\u7b49 B\uff0e\u4e24\u9510\u89d2\u5bf9\u5e94\u76f8\u7b49 C\uff0e\u4e00\u6761\u8fb9\u5bf9\u5e94\u76f8\u7b49 D\uff0e\u4e24\u6761\u76f4\u89d2\u8fb9\u5bf9\u5e94\u76f8\u7b49 8\uff0e \u76f4\u7ebf \u5173\u4e8e \u8f74\u5bf9\u79f0\u7684\u76f4\u7ebf\u7684\u89e3\u6790\u5f0f\u4e3a ( ) A\uff0e B\uff0e C\uff0e D\uff0e 9\uff0e \u5982\u56fe\uff0cAB=AC\uff0cAD=AE\uff0c\u2220B=50\u00b0\uff0c\u2220AEC=120\u00b0\uff0c \u5219\u2220DAC\u7684\u5ea6\u6570\u7b49\u4e8e ( ) A\uff0e120\u00b0 B\uff0e70\u00b0 C\uff0e60\u00b0 D\uff0e50\u00b0 10\uff0e\u5df2\u77e5\u5982\u56fe\uff0c\u56fe\u4e2d\u6700\u5927\u7684\u6b63\u65b9\u5f62\u7684\u9762\u79ef\u662f( ) A\uff0e B\uff0e C\uff0e D\uff0e \u4e8c\u3001\u586b\u7a7a\u9898\uff08\u6bcf\u5c0f\u98983\u5206\uff0c\u517124\u5206\uff09 11\uff0e\u591a\u9879\u5f0f \u662f \u6b21 \u9879\u5f0f\uff0e 12\uff0e\u82e5 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cm\uff0cAB=_________cm\uff0e 17\uff0e\u5982\u56fe\uff0c\u5728\u25b3ABC\u4e2d\uff0c\u2220C=90\u00b0\uff0cAD\u5e73\u5206\u2220BAC\uff0cBC=10cm\uff0c BD=7cm\uff0c\u5219\u70b9D\u5230AB\u7684\u8ddd\u79bb\u4e3a_____________cm\uff0e 18\uff0e\u5728\u5e73\u9762\u76f4\u89d2\u5750\u6807\u7cfb \u4e2d\uff0c\u5df2\u77e5\u70b9A\uff082\uff0c\uff0d2\uff09\uff0c\u5728 \u8f74\u4e0a \u786e\u5b9a\u70b9P\uff0c\u4f7f\u25b3AOP\u4e3a\u7b49\u8170\u4e09\u89d2\u5f62\uff0c\u5219\u7b26\u5408\u6761\u4ef6\u7684\u6709_______\u4e2a\uff0e \u4e09\u3001\u89e3\u7b54\u9898\uff08\u517120\u5206\uff09 19\uff0e\uff084\u5206\uff09\u8ba1\u7b97\uff1a\uff081\uff09 \uff1b \uff082\uff09 \uff0e 20\uff0e\uff084\u5206\uff09\u7528\u4e58\u6cd5\u516c\u5f0f\u8ba1\u7b97\uff1a \uff081\uff09 \uff1b \uff082\uff09 \uff0e 21\uff0e(12\u5206)\u5206\u89e3\u56e0\u5f0f\uff1a \uff081\uff09 \uff1b \uff082\uff09 \uff1b \uff083\uff09 \uff1b \uff084\uff09 \uff0e \u56db\u3001\u89e3\u7b54\u9898\uff08\u672c\u9898\u51713\u5c0f\u9898\uff1b\u517114\u5206\uff09 22\uff0e(5\u5206)\u5148\u5316\u7b80\uff0c\u518d\u6c42\u503c\uff1a \uff0c\u5176\u4e2dx=2005\uff0cy=2004\uff0e 23\uff0e(5\u5206)\u6c42\u8bc1\uff1a\u7b49\u8170\u4e09\u89d2\u5f62\u4e24\u5e95\u89d2\u76f8\u7b49\uff0e 24\uff0e\uff084\u5206\uff09\u4f5c\u56fe\u9898\uff08\u4e0d\u5199\u4f5c\u56fe\u6b65\u9aa4\uff0c\u4fdd\u7559\u4f5c\u56fe\u75d5\u8ff9\uff09\uff0e \u5df2\u77e5\uff1a\u5982\u56fe\uff0c\u6c42\u4f5c\u70b9P\uff0c\u4f7f\u70b9P\u5230A\u3001B\u4e24\u70b9\u7684 \u8ddd\u79bb\u76f8\u7b49\uff0c\u4e14P\u5230\u2220MON\u4e24\u8fb9\u7684\u8ddd\u79bb\u4e5f\u76f8\u7b49\uff0e \u4e94\u3001\u89e3\u7b54\u9898\uff0842\u5206\uff09 25\uff0e(9\u5206)\u5df2\u77e5\u4e00\u6b21\u51fd\u6570\u7684\u56fe\u8c61\u7ecf\u8fc7\uff083\uff0c5\uff09\u548c\uff08\uff0d4\uff0c\uff0d9\uff09\u4e24\u70b9\uff0e \uff081\uff09\u6c42\u8fd9\u4e2a\u4e00\u6b21\u51fd\u6570\u7684\u89e3\u6790\u5f0f\uff1b\uff082\uff09\u753b\u51fa\u8fd9\u4e2a\u4e00\u6b21\u51fd\u6570\u7684\u56fe\u8c61\uff1b 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y\u8f74\u4e0a\uff0cD\u70b9\u5728x\u8f74\u4e0a)\uff0c\u4e14CD=AB\uff0e \uff081\uff09\u5f53\u25b3COD\u548c\u25b3AOB\u5168\u7b49\u65f6\uff0c\u6c42C\u3001D\u4e24\u70b9\u7684\u5750\u6807\uff1b \uff082\uff09\u662f\u5426\u5b58\u5728\u7ecf\u8fc7\u7b2c\u4e00\u3001\u4e8c\u3001\u4e09\u8c61\u9650\u7684\u76f4\u7ebfCD\uff0c\u4f7fCD\u22a5AB\uff1f\u5982\u679c\u5b58\u5728\uff0c\u8bf7\u6c42\u51fa\u76f4\u7ebfCD\u7684\u89e3\u6790\u5f0f\uff1b\u5982\u679c\u4e0d\u5b58\u5728\uff0c\u8bf7\u8bf4\u660e\u7406\u7531\uff0e \u516b\u5e74\u7ea7\uff08\u4e0a\uff09\u6570\u5b66\u671f\u672b\u7efc\u5408\u6d4b\u8bd5\uff084\uff09 \u53c2\u8003\u7b54\u6848 \u4e00\u3001\u9009\u62e9\u9898\uff08\u6bcf\u5c0f\u98983\u5206\uff0c\u517130\u5206\uff09 1\uff0eB 2\uff0eC 3\uff0eC 4\uff0eA 5\uff0eD 6\uff0eA 7\uff0eD 8\uff0eC 9\uff0eB 10\uff0eC \u4e8c\u3001\u586b\u7a7a\u9898\uff08\u6bcf\u5c0f\u98983\u5206\uff0c\u517124\u5206\uff09 11\uff0e\u4e8c\u3001\u4e09 12\uff0ex \u22607 13\uff0e72\u00b0 14\uff0e 15\uff0e20\uff0c0.4 16\uff0e 17\uff0e3 18\uff0e4 \u4e09\u3001\u89e3\u7b54\u9898\uff08\u517176\u5206\uff09 19\uff0e\uff081\uff09\u539f\u5f0f= \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20261\u5206 = \uff0e \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20262\u5206 \uff082\uff09\u539f\u5f0f= \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20261\u5206 = \uff0e \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20262\u5206 20\uff0e\uff081\uff09\u539f\u5f0f=\uff0860\uff0d0.2 \uff09\uff0860+0.2\uff09 \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20261\u5206 = =3599.96\uff0e \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20262\u5206 \uff082\uff09\u539f\u5f0f= \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20261\u5206 = =39204\uff0e \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20262\u5206 21\uff0e\uff081\uff09\u539f\u5f0f= \uff0e \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20263\u5206 \uff082\uff09\u539f\u5f0f= \uff0e \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20263\u5206 \uff083\uff09\u539f\u5f0f= \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20261\u5206 = \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20262\u5206 = \uff0e \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20263\u5206 \uff084\uff09\u539f\u5f0f= \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20262\u5206 = \uff0e \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20263\u5206 22\uff0e\u539f\u5f0f= \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20262\u5206 = \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20263\u5206 = \uff0e \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20264\u5206 \u5f53 \uff0c \u65f6\uff0c \u539f\u5f0f=2005\uff0d2004 =1\uff0e \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20265\u5206 23\uff0e\u5df2\u77e5\uff1a\u5982\u56fe\uff0c\u25b3ABC\u4e2d\uff0cAB=AC\uff08\u5305\u62ec\u753b\u56fe\uff09\uff0e \u6c42\u8bc1\uff1a\u2220B=\u2220C\uff0e \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20262\u5206 \u8bc1\u660e\uff1a\u7565\uff0e \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20265\u5206 24\uff0e\u4f5c\u56fe\u9898\uff0e\u7565\uff0c\u89d2\u5e73\u5206\u7ebf\u548c\u7ebf\u6bb5\u7684\u5782\u76f4\u5e73\u5206\u7ebf\u6bcf\u753b\u5bf9\u4e00\u4e2a\u5f972\u5206\uff0e 25\uff0e\uff081\uff09\u8bbe\u4e00\u6b21\u51fd\u6570\u89e3\u6790\u5f0f\u4e3a \uff0c\u7531\u9898\u610f\uff0c\u5f97 \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20262\u5206 \u89e3\u4e4b\uff0c\u5f97 \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20264\u5206 \u56e0\u6b64\u4e00\u6b21\u51fd\u6570\u7684\u89e3\u6790\u5f0f\u4e3a \uff0e\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20265\u5206 \uff082\uff09\u56fe\u7565\uff0e \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20267\u5206 \uff083\uff09\u5c06\uff08 \uff0c2\uff09\u4ee3\u5165 \uff0c\u5f97 \uff0e \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20268\u5206 \u89e3\u5f97 \uff0e \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20269\u5206 26\uff0e\u70b9B\u5173\u4e8e \u8f74\u5bf9\u79f0\u7684\u70b9\u7684\u5750\u6807\u662fB\u2032\uff082\uff0c\uff0d4\uff09\uff0e \u8fdeAB\u2032\uff0c\u5219AB\u2032\u4e0e \u8f74\u7684\u4ea4\u70b9\u5373\u4e3a\u6240\u6c42\uff0e \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20261\u5206 \u8bbeAB\u2032\u6240\u5728\u76f4\u7ebf\u7684\u89e3\u6790\u5f0f\u4e3a \uff0c \u5219 \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20262\u5206 \u5219 \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20263\u5206 \u6240\u4ee5\u76f4\u7ebfAB\u7684\u89e3\u6790\u5f0f\u4e3a \uff0e \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20264\u5206 \u5f53 \u65f6\uff0c \uff0e\u6545\u6240\u6c42\u7684\u70b9\u4e3a \uff0e \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20266\u5206 27\uff0e\uff081\uff09\u4e59\uff0c\u7532\uff0c\u4e19\uff1b \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20263\u5206 \uff082\uff09\u753214.75\uff0c\u4e5915.9\uff0c\u4e1915.35\uff0c\u5f55\u53d6\u4e59\uff1b \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20265\u5206 \uff083\uff09\u7565\uff0e \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20267\u5206 28\uff0e\uff081\uff09\u7531\u9898\u610f\uff0c\u5f97 \uff0e \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20266\u5206 \uff082\uff09\u56e0\u4e3a \u968f\u7740 \u7684\u51cf\u5c0f\u800c\u51cf\u5c0f\uff0c\u6240\u4ee5\u5f53 \u65f6\uff0c \u6700\u5c0f=10\u00d740\uff0b4800=5200\uff08\u5143\uff09\uff0e\u7b54\uff1a\u7565\uff0e \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20268\u5206 29\uff0e\uff081\uff09\u7531\u9898\u610f\uff0c\u5f97A\uff082\uff0c0\uff09\uff0cB\uff080\uff0c4\uff09\uff0c \u5373AO=2\uff0cOB=4\uff0e \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20262\u5206 \u2460\u5f53\u7ebf\u6bb5CD\u5728\u7b2c\u4e00\u8c61\u9650\u65f6\uff0c \u70b9C\uff080\uff0c4\uff09\uff0cD\uff082\uff0c0\uff09\u6216C\uff080\uff0c2\uff09\uff0cD\uff084\uff0c0\uff09\uff0e\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u20264\u5206 \u2461\u5f53\u7ebf\u6bb5CD\u5728\u7b2c\u4e8c\u8c61\u9650\u65f6\uff0c \u70b9C\uff080\uff0c4\uff09\uff0cD\uff08\uff0d2\uff0c0\uff09\u6216C\uff080\uff0c2\uff09\uff0cD\uff08\uff0d4\uff0c0\uff09\uff0e\u2026\u2026\u2026\u2026\u2026\u2026\u20266\u5206 \u2462\u5f53\u7ebf\u6bb5CD\u5728\u7b2c\u4e09\u8c61\u9650\u65f6\uff0c \u70b9C\uff080\uff0c\uff0d4\uff09\uff0cD\uff08\uff0d2\uff0c0\uff09\u6216C\uff080\uff0c\uff0d2\uff09\uff0cD\uff08\uff0d4\uff0c0\uff09\uff0e\u2026\u2026\u2026\u2026\u20268\u5206 \u2463\u5f53\u7ebf\u6bb5CD\u5728\u7b2c\u4e00\u8c61\u9650\u65f6\uff0c \u70b9C\uff080\uff0c\uff0d4\uff09\uff0cD\uff082\uff0c0\uff09\u6216C\uff080\uff0c\uff0d2\uff09\uff0cD\uff084\uff0c0\uff09 \u2026\u2026\u2026\u2026\u2026\u202610\u5206 \uff082\uff09C\uff080\uff0c2\uff09\uff0cD\uff08\uff0d4\uff0c0\uff09\uff0e\u76f4\u7ebfCD\u7684\u89e3\u6790\u5f0f\u4e3a \uff0e\u2026\u2026\u2026\u202612\u5206

一、选择题
1、下列四个函数中,在同一象限内,当x增大时,y值减小的函数是( )
A、y=5x B、 C、y=3x+2 D、
2、下列四组线段中,不构成比例线段的一组是( )
A、1cm, 2cm, 3cm, 6cm B、2cm, 3cm, 4cm, 6cm,
C、1cm, cm, cm, cm, D、1cm, 2cm, 3cm, 4cm,
3、不等式 的正整数解有( )
A.2个 B.3个 C.4个 D.5个
4、不等式组 的解集为( )
A. ≤x≤4 B. <x≤4 C. <x<4 D. ≤x<4
5、如图,A、B两点被池塘隔开,在AB外任选一点C,连结AC、BC分别取其三等分点M、N量得 MN=38m.则AB的长是
A. 152m B.114m C.76m D.104m

(第5题图) (第8题图)
6、下列各式从左到右的变形不正确的是( )
A. B . C. D.
7、已知△ABC中,∠ABC与∠ACB的平分线交于O,则∠BOC一定( )
A.小于直角 B.等于直角 C.大于直角 D.大于或等于直角
8、如图,在矩形ABCD中,点E是AD上任意一点,则有 ( )
A.△ABE的周长△CDE的周长=△BCE的周长
B.△ABE的面积+△CDE的面积=△BCE的面积
C.△ABE∽△DEC
D.△ABE∽△EBC
9、化简 的结果是( )
A. B. C. D.
10、△ABC的三边之比为3:4:6,且△ABC∽△ ,若△ 中最短边长为9,则它的最长边长为( ) A.21 B.18 C.12 D.9
二、填空题
11、双曲线 经过点(3,k)则k=
12、化简: =
13、如图,CD平分∠ACB,AE‖DC交BC的延长线于点E,若∠ACE=80°,则∠CAE= 度.

(第10题图) (第13题图) (第15题图)
14、已知关于x的不等式组 无解,则a的取值范围是________.
15、如图,在等边三角形ABC中,点D、E分别在AB、AC边上,且DE‖BC.如果BC=8 cm,AD∶AB=1∶4,那么△ADE的周长等于________ cm.
16、已知,如图,反比例函数 ,点P是图上任意一点, PM⊥x轴,Pn⊥y轴,则四方形OMPN的面积为 。

17、在比例尺为1:200 000的交通图上,距离为15厘米的两地之间的实际距离约为 千米.
18、如图,阳光通过窗口照到室内,在地面上留下1.6m宽的亮区DE,已知亮区一边到窗下的墙脚距离CE=3.6m,窗高AB=1.2m,那么窗口底边离地面的高度BC= m .
三、解答题
19、计算:

20、解方程:

21、小莉有红色、白色、蓝色上衣各一件,黄色、黑色长裤各一条。(1)有树状图分析小莉穿法的搭配情况;(2)小莉共有多少不同的穿法?(3)小莉上衣穿黑色的机会是多少?

22、如图,ABCD是平行四边形,点E在边BC延长线上,连AE交CD于点F,如果∠EAC=∠D.
试证明:AC•BE=AE•CD.

23、如图,正方形ABCD在边长为5cm,用一块三角板,使它的一直角边始终经过点A,直角顶点E在BC上移动,另一直角边交CD于点F,如果BE=x cm,CF=y cm.
试用x的代数式表示y(不需要写出x的范围).

24.小华做小孔成像实验,如图,已知蜡烛与成像板间的距离为50cm,问蜡烛与成像板间的孔纸板在何处式,蜡烛焰AB是像A’B’的一半长。

25.已知一次函数 的图象与反比例函数边长为( ) A.21 B.18 C.12 D.9
二、填空题
11、双曲线 经过点(3,k)则k=
12、化简: =
13、如图,CD平分∠ACB,AE‖DC交BC的延长线于点E,若∠ACE=80°,则∠CAE= 度.

(第10题图) (第13题图) (第15题图)
14、已知关于x的不等式组 无解,则a的取值范围是________.
15、如图,在等边三角形ABC中,点D、E分别在AB、AC边上,且DE‖BC.如果BC=8 cm,AD∶AB=1∶4,那么△ADE的周长等于________ cm.
16、已知,如图,反比例函数 ,点P是图上任意一点, PM⊥x轴,Pn⊥y轴,则四方形OMPN的面积为 。

17、在比例尺为1:200 000的交通图上,距离为15厘米的两地之间的实际距离约为 千米.
18、如图,阳光通过窗口照到室内,在地面上留下1.6m宽的亮区DE,已知亮区一边到窗下的墙脚距离CE=3.6m,窗高AB=1.2m,那么窗口底边离地面的高度BC= m .
三、解答题
19、计算:

20、解方程:

21、小莉有红色、白色、蓝色上衣各一件,黄色、黑色长裤各一条。(1)有树状图分析小莉穿法的搭配情况;(2)小莉共有多少不同的穿法?(3)小莉上衣穿黑色的机会是多少?

22、如图,ABCD是平行四边形,点E在边BC延长线上,连AE交CD于点F,如果∠EAC=∠D.
试证明:AC•BE=AE•CD.

23、如图,正方形ABCD在边长为5cm,用一块三角板,使它的一直角边始终经过点A,直角顶点E在BC上移动,另一直角边交CD于点F,如果BE=x cm,CF=y cm.
试用x的代数式表示y(不需要写出x的范围).

24.小华做小孔成像实验,如图,已知蜡烛与成像板间的距离为50cm,问蜡烛与成像板间的孔纸板在何处式,蜡烛焰AB是像A’B’的一半长。

边长为( ) A.21 B.18 C.12 D.9
二、填空题
11、双曲线 经过点(3,k)则k=
12、化简: =
13、如图,CD平分∠ACB,AE‖DC交BC的延长线于点E,若∠ACE=80°,则∠CAE= 度.

(第10题图) (第13题图) (第15题图)
14、已知关于x的不等式组 无解,则a的取值范围是________.
15、如图,在等边三角形ABC中,点D、E分别在AB、AC边上,且DE‖BC.如果BC=8 cm,AD∶AB=1∶4,那么△ADE的周长等于________ cm.
16、已知,如图,反比例函数 ,点P是图上任意一点, PM⊥x轴,Pn⊥y轴,则四方形OMPN的面积为 。

17、在比例尺为1:200 000的交通图上,距离为15厘米的两地之间的实际距离约为 千米.
18、如图,阳光通过窗口照到室内,在地面上留下1.6m宽的亮区DE,已知亮区一边到窗下的墙脚距离CE=3.6m,窗高AB=1.2m,那么窗口底边离地面的高度BC= m .
三、解答题
19、计算:

20、解方程:

21、小莉有红色、白色、蓝色上衣各一件,黄色、黑色长裤各一条。(1)有树状图分析小莉穿法的搭配情况;(2)小莉共有多少不同的穿法?(3)小莉上衣穿黑色的机会是多少?

22、如图,ABCD是平行四边形,点E在边BC延长线上,连AE交CD于点F,如果∠EAC=∠D.
试证明:AC•BE=AE•CD.

23、如图,正方形ABCD在边长为5cm,用一块三角板,使它的一直角边始终经过点A,直角顶点E在BC上移动,另一直角边交CD于点F,如果BE=x cm,CF=y cm.
试用x的代数式表示y(不需要写出x的范围).

24.小华做小孔成像实验,如图,已知蜡烛与成像板间的距离为50cm,问蜡烛与成像板间的孔纸板在何处式,蜡烛焰AB是像A’B’的一半长。

25.已知一次函数 的图象与反比例函数

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