初一数学30道整式的加减测试题及答案 30道整式的加减混合运算题.要有步骤和答案，写详细。。。
\u6c42\u521d\u4e00\u6570\u5b66 \u300a\u6574\u5f0f\u7684\u52a0\u51cf\u300b\u7efc\u5408\u6d4b\u8bd5\u9898\u4e00\u4efd\u53ca\u7b54\u6848\u7b2c\u4e00\u5b66\u671f\u4e03\u5e74\u7ea7\u6570\u5b66\u5355\u5143\u8bd5\u5377(\u4e8c)
\uff08\u5185\u5bb9\uff1a\u7b2c\u4e8c\u7ae0 \u6574\u5f0f\u7684\u52a0\u51cf\uff09
\uff08\u6ee1\u5206\uff1a100\u5206\uff1b\u8003\u8bd5\u65f6\u95f4\uff1a100\u5206\u949f\uff09
\u73ed\u7ea7\uff1a \u5ea7\u53f7\uff1a \u59d3\u540d\uff1a
\u9898\u53f7 \u4e00
(1-12) \u4e8c
(13-18) \u4e09 \u56db \u603b\u5206
19 20 21 22 23 24
\u5f97\u5206
\u4e00\u3001\u8010\u5fc3\u586b\u4e00\u586b\uff0c\u4f60\u4f1a\u586b\u5f97\u53c8\u5feb\u53c8\u51c6\uff08\u6bcf\u5c0f\u98982\u5206\uff0c\u517124\u5206\uff09
1. \u5355\u9879\u5f0f \u7684\u7cfb\u6570\u662f ,\u6b21\u6570\u662f .
2. \u4e00\u4e2a\u4e24\u4f4d\u6570\uff0c\u4e2a\u4f4d\u6570\u5b57\u662fa\uff0c\u5341\u4f4d\u6570\u5b57\u6bd4\u4e2a\u4f4d\u6570\u5b57\u59272\uff0c\u5219\u8fd9\u4e2a\u4e24\u4f4d\u6570\u662f_____.
3. \u5355\u9879\u5f0f \u3001 \u3001 \u7684\u548c\u4e3a \uff1b
4. \u5f53 \u65f6\uff0c\u4ee3\u6570\u5f0f \u7684\u503c\u662f \uff1b
5. \u8ba1\u7b97\uff1a \uff1b
6. \u82e5 \u4e0e \u662f\u540c\u7c7b\u9879,\u5219 = .
7. \u3001 \u4e24\u6570\u7684\u5e73\u65b9\u548c\u51cf\u53bb \u4e58\u79ef\u76842\u500d\u7684\u5dee\u7528\u4ee3\u6570\u5f0f\u8868\u793a\u662f \uff1b
8. \u89c4\u5b9a\u4e00\u79cd\u65b0\u8fd0\u7b97: ,\u5982 ,\u8bf7\u6bd4\u8f83\u5927\u5c0f: (\u586b\u201c>\u201d\u3001\u201c=\u201d\u6216\u201c>\u201d).
9. \u6839\u636e\u751f\u6d3b\u7ecf\u9a8c\uff0c\u5bf9\u4ee3\u6570\u5f0f \u4f5c\u51fa\u89e3\u91ca\uff1a \uff1b
10. \u4e0b\u9762\u662f\u4e00\u7ec4\u6570\u503c\u8f6c\u6362\u673a,\u5199\u51fa(1)\u7684\u8f93\u51fa\u7ed3\u679c(\u5199\u5728\u6a2a\u7ebf\u4e0a),\u627e\u51fa(2)\u7684\u8f6c\u6362\u6b65\u9aa4(\u586b \u5199\u5728\u6846\u5185).
11. \u67d0\u57ce\u5e02\u6309\u4ee5\u4e0b\u89c4\u5b9a\u6536\u53d6\u6bcf\u6708\u7684\u7164\u6c14\u8d39\uff1a\u7528\u6c14\u4e0d\u8d85\u8fc760\u7acb\u65b9\u7c73\uff0c\u6309\u6bcf\u7acb\u65b9\u7c730.8\u5143\u6536\u8d39\uff1b\u5982\u679c\u8d85\u8fc760\u7acb\u65b9\u7c73\uff0c\u8d85\u8fc7\u90e8\u5206\u6bcf\u7acb\u65b9\u7c73\u63091.2\u5143\u6536\u8d39.\u5df2\u77e5\u67d0\u6237\u7528\u7164\u6c14x\u7acb\u65b9\u7c73\uff08x>60\uff09\uff0c\u5219\u8be5\u6237\u5e94\u4ea4\u7164\u6c14\u8d39 \u5143.
12. \u89c2\u5bdf\u4e0b\u5217\u5355\u9879\u5f0f\uff1a0\uff0c3x2\uff0c8x3\uff0c15x4\uff0c24x5\uff0c\u2026\u2026\uff0c\u6309\u6b64\u89c4\u5f8b\u5199\u51fa\u7b2c13\u4e2a\u5355\u9879\u5f0f\u662f______\u3002
\u4e8c\u3001\u7cbe\u5fc3\u9009\u4e00\u9009\uff0c\u4f60\u4e00\u5b9a\u80fd\u9009\u5bf9,\u6bcf\u5c0f\u9898\u6709\u4e14\u53ea\u6709\u4e00\u4e2a\u9009\u9879\u6b63\u786e\uff08\u6bcf\u5c0f\u98983\u5206\uff0c\u517118\u5206\uff09
13. \u4e0b\u9762\u7684\u6b63\u786e\u7ed3\u8bba\u7684\u662f \uff08 \uff09
A. 0\u4e0d\u662f\u5355\u9879\u5f0f B. 52abc\u662f\u4e94\u6b21\u5355\u9879\u5f0f
C. \uff0d4\u548c4\u662f\u540c\u7c7b\u9879 D. 3m2n3\uff0d3m3n2=0
14. \u4e0b\u9762\u8fd0\u7b97\u6b63\u786e\u7684\u662f ( )
A. B.
C. D.
15. \u4e0b\u9762\u662f\u5c0f\u82b3\u505a\u7684\u4e00\u9053\u591a\u9879\u5f0f\u7684\u52a0\u51cf\u8fd0\u7b97\u9898,\u4f46\u5979\u4e0d\u5c0f\u5fc3\u628a\u4e00\u6ef4\u58a8\u6c34\u6ef4\u5728\u4e86\u4e0a\u9762.
,\u9634\u5f71\u90e8\u5206\u5373\u4e3a\u88ab\u58a8\u8ff9\u5f04\u6c61\u7684\u90e8\u5206.\u90a3\u4e48\u88ab\u58a8\u6c41\u906e\u4f4f\u7684\u4e00\u9879\u5e94\u662f ( )
A. B. C. D.
16. \u7528\u68cb\u5b50\u6446\u51fa\u4e0b\u5217\u4e00\u7ec4\u4e09\u89d2\u5f62,\u4e09\u89d2\u5f62\u6bcf\u8fb9\u6709 \u679a\u68cb\u5b50,\u6bcf\u4e2a\u4e09\u89d2\u5f62\u7684\u68cb\u5b50\u603b\u6570\u662f .\u6309\u6b64\u89c4\u5f8b\u63a8\u65ad,\u5f53\u4e09\u89d2\u5f62\u8fb9\u4e0a\u6709 \u679a\u68cb\u5b50\u65f6,\u8be5\u4e09\u89d2\u5f62\u7684\u68cb\u5b50\u603b\u6570 \u7b49\u4e8e ( )
A. B. C. D.
17. \u4e0b\u5217\u5404\u7ec4\u4ee3\u6570\u5f0f\u4e2d\u4e92\u4e3a\u76f8\u53cd\u6570\u7684\u6709 \uff08 \uff09
\uff081\uff09a\uff0db\u4e0e\uff0da\uff0db\uff1b\uff082\uff09a\uff0bb\u4e0e\uff0da\uff0db\uff1b\uff083\uff09a\uff0b1\u4e0e1\uff0da\uff1b\uff084\uff09\uff0da\uff0bb\u4e0ea\uff0db.
A.\uff081\uff09\uff082\uff09\uff084\uff09 B.\uff082\uff09\u4e0e\uff084\uff09 C.\uff081\uff09\uff083\uff09\uff084\uff09 D.\uff083\uff09\u4e0e\uff084\uff09
18. \u628a(x\uff0d3)2\uff0d2(x\uff0d3)\uff0d5(x\uff0d3)2+(x\uff0d3)\u4e2d\u7684(x\uff0d3)\u770b\u6210\u4e00\u4e2a\u56e0\u5f0f\u5408\u5e76\u540c\u7c7b\u9879\uff0c\u7ed3\u679c\u5e94\u662f
\uff08 \uff09
A. \uff0d4(x\uff0d3)2+(x\uff0d3) B. 4(x\uff0d3)2\uff0dx (x\uff0d3)
C. 4(x\uff0d3)2\uff0d(x\uff0d3) D. \uff0d4(x\uff0d3)2\uff0d(x\uff0d3)
\u4e09\u3001\u7ec6\u5fc3\u7b97\u4e00\u7b97\uff0c\u4e00\u5b9a\u7b97\u5bf9\u54df\uff01\uff08\u517120\u5206\uff09
19. \u5316\u7b80: \uff08\u51714\u5c0f\u9898\uff0c\u6bcf\u98985\u5206\uff0c\u517120\u5206\uff09
\uff081\uff09 \uff1b \uff082\uff09 \uff1b
\uff083\uff09 \uff1b \uff084\uff09 .
\u56db\u3001\u89e3\u7b54\u9898\uff1a\u7528\u5fc3\u60f3\u4e00\u60f3\uff0c\u4f60\u4e00\u5b9a\u80fd\u6210\u529f\u3002\uff08\u517138\u5206\uff09
20. (6\u5206)\u6211\u56fd\u8fdb\u53e3\u5173\u7a0e\u8fd1\u5e74\u6765\u6709\u4e24\u6b21\u5927\u5e45\u5ea6\u4e0b\u8c03,\u7b2c\u4e00\u6b21\u964d\u4f4e\u4e8640%,\u7b2c\u4e8c\u6b21\u53c8\u5728\u7b2c\u4e00\u6b21\u7684\u57fa\u7840\u4e0a\u964d\u4f4e\u4e8630%.
(1)\u82e5\u672a\u964d\u7a0e\u524d\u67d0\u79cd\u5546\u54c1\u7684\u7a0e\u6b3e\u4e3a \u4e07\u5143,\u7528\u6574\u5f0f\u8868\u793a\u73b0\u5728\u7684\u5b9e\u9645\u7a0e\u6b3e.
(2)\u82e5 \u4e07\u5143,\u8bd5\u6c42\u73b0\u5728\u7684\u5b9e\u9645\u7a0e\u6b3e.
21. (8\u5206)\u6709\u8fd9\u6837\u4e00\u9053\u9898\u201c\u5f53 \u65f6,\u6c42\u591a\u9879\u5f0f
\u7684\u503c\u201d,\u9a6c\u5c0f\u864e\u505a\u9898\u65f6\u628a \u9519\u6284\u6210 ,\u738b\u5c0f\u771f\u6ca1\u6284\u9519\u9898,\u4f46\u4ed6\u4eec\u505a\u51fa\u7684\u7ed3\u679c\u5374\u90fd\u4e00\u6837,\u4f60\u77e5\u9053\u8fd9\u662f\u600e\u4e48\u56de\u4e8b\u5417?\u8bf4\u660e\u7406\u7531.
22. (8\u5206)\u67d0\u5546\u5e97\u6709\u4e24\u4e2a\u8fdb\u4ef7\u4e0d\u540c\u7684\u8ba1\u7b97\u5668\u90fd\u5356\u4e86 \u5143,\u5176\u4e2d\u4e00\u4e2a\u76c8\u522960%,\u53e6\u4e00\u4e2a\u4e8f\u672c20%,\u5728\u8fd9\u6b21\u4e70\u5356\u4e2d,\u8fd9\u5bb6\u5546\u5e97\u662f\u8d5a\u4e86,\u8fd8\u662f\u8d54\u4e86?\u8d5a\u4e86\u6216\u8d54\u4e86\u591a\u5c11?
23. (6\u5206)\u8bd5\u81f3\u5c11\u5199\u4e24\u4e2a\u53ea\u542b\u6709\u5b57\u6bcd \u3001 \u7684\u591a\u9879\u5f0f,\u4e14\u6ee1\u8db3\u4e0b\u5217\u6761\u4ef6:(1)\u516d\u6b21\u4e09\u9879\u5f0f;(2)\u6bcf\u4e00\u9879\u7684\u7cfb\u6570\u5747\u4e3a1\u6216-1;(3)\u4e0d\u542b\u5e38\u6570\u9879;(4)\u6bcf\u4e00\u9879\u5fc5\u987b\u540c\u65f6\u542b\u5b57\u6bcd \u3001 ,\u4f46\u4e0d\u80fd\u542b\u6709\u5176\u4ed6\u5b57\u6bcd.
24. (10\u5206)\u67d0\u519c\u62372000\u5e74\u627f\u5305\u8352\u5c71\u82e5\u5e72\u4ea9\uff0c\u6295\u8d447800\u5143\u6539\u9020\u540e\uff0c\u79cd\u679c\u68112000\u68f5.\u4eca\u5e74\u6c34\u679c\u603b\u4ea7\u91cf\u4e3a18000\u5343\u514b\uff0c\u6b64\u6c34\u679c\u5728\u5e02\u573a\u4e0a\u6bcf\u5343\u514b\u552ea\u5143\uff0c\u5728\u679c\u56ed\u6bcf\u5343\u514b\u552eb\u5143\uff08b\uff1ca\uff09.\u8be5\u519c\u6237\u5c06\u6c34\u679c\u62c9\u5230\u5e02\u573a\u51fa\u552e\u5e73\u5747\u6bcf\u5929\u51fa\u552e1000\u5343\u514b\uff0c\u97008\u4eba\u5e2e\u5fd9\uff0c\u6bcf\u4eba\u6bcf\u5929\u4ed8\u5de5\u8d4425\u5143\uff0c\u519c\u7528\u8f66\u8fd0\u8d39\u53ca\u5176\u4ed6\u5404\u9879\u7a0e\u8d39\u5e73\u5747\u6bcf\u5929100\u5143.
\uff081\uff09\u5206\u522b\u7528a\uff0cb\u8868\u793a\u4e24\u79cd\u65b9\u5f0f\u51fa\u552e\u6c34\u679c\u7684\u6536\u5165\uff1f
\uff082\uff09\u82e5a\uff1d1.3\u5143\uff0cb\uff1d1.1\u5143\uff0c\u4e14\u4e24\u79cd\u51fa\u552e\u6c34\u679c\u65b9\u5f0f\u90fd\u5728\u76f8\u540c\u7684\u65f6\u95f4\u5185\u552e\u5b8c\u5168\u90e8\u6c34\u679c\uff0c\u8bf7\u4f60\u901a\u8fc7\u8ba1\u7b97\u8bf4\u660e\u9009\u62e9\u54ea\u79cd\u51fa\u552e\u65b9\u5f0f\u8f83\u597d.
\uff083\uff09\u8be5\u519c\u6237\u52a0\u5f3a\u679c\u56ed\u7ba1\u7406\uff0c\u529b\u4e89\u5230\u660e\u5e74\u7eaf\u6536\u5165\u8fbe\u523015000\u5143\uff0c\u90a3\u4e48\u7eaf\u6536\u5165\u589e\u957f\u7387\u662f\u591a\u5c11\uff08\u7eaf\u6536\u5165\uff1d\u603b\u6536\u5165\uff0d\u603b\u652f\u51fa\uff09\uff0c\u8be5\u519c\u6237\u91c7\u7528\u4e86\uff082\uff09\u4e2d\u8f83\u597d\u7684\u51fa\u552e\u65b9\u5f0f\u51fa\u552e\uff09\uff1f
\u53c2\u8003\u7b54\u6848
\u4e00\u3001\u586b\u7a7a\u9898\uff08\u6bcf\u5c0f\u98982\u5206\uff0c\u517124\u5206\uff09
1\u3001 , 4\uff1b 2\u300111a+20\uff1b 3\u3001 \uff1b 4\u3001 \uff1b 5\u3001 \uff1b 6\u3001 \uff1b7\u3001 \uff1b 8\u3001=\uff1b 9\u3001\u5982: \u4eca\u5e74\u5c0f\u534e\u5e74\u9f84\u662f \u5c81\uff0c\u4ed6\u7684\u54e5\u54e5\u5e74\u9f84\u662f \u5c81\uff0c\u5c0f\u534e\u548c\u4ed6\u54e5\u54e5\u7684\u5e74\u9f84\u5171 \u5c81\uff1b 10\u3001 \uff1b 11\u30011.2 x\uff0d24.\uff1b 12\u3001\uff08132-1\uff09x13=168x13.
\u4e8c\u3001\u9009\u62e9\u9898\uff1a\uff08\u6bcf\u5c0f\u98983\u5206\uff0c\u517118\u5206\uff09
13\u3001C 14\u3001 B 15\u3001C 16\u3001 A 17\u3001 B 18\u3001D
\u4e09\u3001 \u8ba1\u7b97\u9898\uff08\u51714\u5c0f\u9898\uff0c\u6bcf\u98985\u5206\uff0c\u517120\u5206\uff09
19\u3001\uff081\uff09\uff0d \u3001\uff082\uff095 x2\uff0d3 x\uff0d3\u3001\uff083\uff09xy\u3001\uff084\uff093a2b\uff0dab2\uff1b
\u56db\u3001\u89e3\u7b54\u9898\uff1a(\u517138\u5206\uff09
20\u3001(1) (\u4e07\u5143);(2)\u5f53 \u65f6, (\u4e07\u5143).
21\u3001\u5c06\u4ee3\u6570\u5f0f\u8fdb\u884c\u5316\u7b80,\u53ef\u5f97 .\u56e0\u4e3a\u5b83\u4e0d\u542b\u6709\u5b57\u6bcd ,\u6240\u4ee5\u4ee3\u6570\u5f0f\u7684\u503c\u4e0e \u7684\u53d6\u503c\u65e0\u5173\uff1b
22\u3001\u6839\u636e\u9898\u610f,\u53ef\u5f97\u7b2c\u4e00\u4e2a\u8ba1\u7b97\u5668\u7684\u8fdb\u4ef7\u4e3a ,\u5356\u4e00\u4e2a\u8fd9\u79cd\u8ba1\u7b97\u5668\u53ef\u8d5a (\u5143);\u540c\u7406,\u53ef\u5f97\u7b2c\u4e8c\u4e2a\u8ba1\u7b97\u5668\u7684\u8fdb\u4ef7\u4e3a ,\u5356\u4e00\u4e2a\u8fd9\u79cd\u8ba1\u7b97\u5668\u4e8f\u672c (\u5143),\u6240\u4ee5\u8fd9\u6b21\u4e70\u5356\u4e2d\u53ef\u8d5a \u5143.
23\u3001\u4e0b\u9762\u662f\u4e24\u79cd\u53ef\u80fd\u7684\u7b54\u6848: ; .
24\u3001 \uff081\uff09\u5c06\u8fd9\u6279\u6c34\u679c\u62c9\u5230\u5e02\u573a\u4e0a\u51fa\u552e\u6536\u5165\u4e3a18000a\uff0d \u00d78\u00d725\uff0d \u00d7100\uff1d18000a\uff0d3600\uff0d1800\uff1d18000a\uff0d5400\uff08\u5143\uff09.\u5728\u679c\u56ed\u76f4\u63a5\u51fa\u552e\u6536\u5165\u4e3a18000b\u5143.\uff082\uff09\u5f53a\uff1d1.3\u65f6\uff0c\u5e02\u573a\u6536\u5165\u4e3a18000a\uff0d5400\uff1d18000\u00d71.3\uff0d5400\uff1d18000\uff08\u5143\uff09.\u5f53b\uff1d1.1\u65f6\uff0c\u679c\u56ed\u6536\u5165\u4e3a18000b\uff1d18000\u00d71.1\uff1d19800\uff08\u5143\uff09.\u56e0\u4e3a18000<19800\uff0c\u6240\u4ee5\u5e94\u9009\u62e9\u5728\u679c\u56ed\u51fa\u552e.\uff083\uff09\u56e0\u4e3a\u4eca\u5e74\u7684\u7eaf\u6536\u5165\u4e3a19800\uff0d7800\uff1d12000\uff0c\u6240\u4ee5 \u00d7100%\uff1d25%\uff0c\u6240\u4ee5\u589e\u957f\u7387\u4e3a25%.
\u524d\u976215\u4e2a\u6709\u7b54\u6848\uff0c\u540e\u976215\u6ca1\u6709
1.\uff08x²-7x-2)-(-2x²+4x-1)
= x²-7x-2+2x²-4x+1
=3x²-11x-1
2. -2y³+(3xy²-x²y)-2(xy²-y³)
=-2y³+3xy²-x²y-2xy²+2y³
=xy²-x²y
3. 2y+(-2y+5)-(3y+2)
=2y-2y+5-3y-2
=3-3y
4. -2(3x+z)-(-6x)+(-5y+3z)
=-6x-2z+6x-5y+3z
=z-5y
5. \u5df2\u77e5x\u2264y\uff0cx+y-|x-y|
=x+y-(y-x)
=x+y-y+x
=2x
6. 3x-[y-(2x+y)]
=3x-(y-2x-y)
=3x+2x
=5x
7. \u5316\u7b80|1-x+y|-|x-y|(\u5176\u4e2dx\uff1c0\uff0cy\uff1e0)
=(1-x+y)-(y-x)
=1-x+y-y+x
=1
8. \u5316\u7b80x-[y-2x-(x+y)]
=x-(y-2x-x-y)
=x+3x
=4x
9. 3a-(2a-3b)+3(a-2b)-b
=3a-2a+3b+3a-6b-b
=4a-4b
10.5-(1-x)-1-(x-1)
=5+1+x-1-x+1
=6
11.-9(x-2)²+(x+5)²
=-9\uff08x²-4x+4\uff09+(x²+10x+25)
=-9x²+36x-36+x²+10x+25
=-8x²+46x-11
12.(2x²-y²)-[2y²-(x²+2xy)]
=2x²-y²-(2y²-x²-2xy)
=2x²-y²-2y²+x²+2xy
=3x²-3y²+2xy
13.2(a²b+ab²)-2(a²b-1)-2ab²-2
=2a²b+2ab²-2a²b+2-2ab²-2
=0
14.\u5f532y-x=-5\u65f6\uff0c5(x-2y)-3(-x+2y)-100
=-5(2y-x)-3(2y-x)-100
=(-5)*(-5)-3*(-5)-100
=-60
15.1-[b-2(1-5a)]-(-3b+5a)
=1-(b-2+10a)+3b-5a
=1-b+2-10a+3b-5a
=2b-15a+3
16.-2(3x+z)-(-6x)+(-5y+3z)
17.-5an-an+1-(-7an+1)+(-3an)
18.2a-\uff083a-2b+2\uff09+\uff083a-4b-1)
19.3a-(2a-4b-6c)+3(-2c+2b)
20.9a²+[7a²-2a-(-a²+3a)]
21.2a-(3a-2b+2)+(3a-4b-1)
22.2a²-(3a²-2b²+2ab+2)+(3a²-4b²-1)
23.2y²+(2y-5)²-(3y+2)²
24.3ab²-4a²b+8a²b-7ab²+3ab
25.\u5df2\u77e5A=2x³-2x²+x-4\uff0cB=2x³-5x+3\uff0c\u8ba1\u7b97A-B
26.4x²-[7x²-5x-3(1-2x+x²)]
27.2x+2y-[3x-2(x-y)]
28.(4xy²-2x²y)-( )=x3-2x²y+4xy²+y³
29.\u82e5\u4e00\u4e2a\u591a\u9879\u5f0f\u52a0\u4e0a-3x²y+2x²-3xy-4\u5f972x²y+3xy²-x²+2xy\u5219\u8fd9\u4e2a\u591a\u9879\u5f0f\u4e3a______\uff0e
30.\u5df2\u77e5A=a²+2b²-3c²\uff0cB=-b²-2c²+3a²\uff0cC=c²+2a²-3b²\uff0c\u6c42(A-B)+C
31.2x-(x+3y)-(-x-y)-(x-y)
1. 化简(-2x+y)+3(x-2y)等于( )
A.-5x+5y B.-5x-y C.x-5y D.-x-y
2. 多项式-a2-1与3a2-2a+1的和为( )
A.2a2-2a B.4a2-2a+2 C.4a2-2a-2 D.2a2+2a
3.在5a+(________)=5a-2a2-b中，括号内应填( ) A.2a2+b B.2a2-b C.-2a2+b D.-2a2-b
4. 已知长方形的长为(2b-a),宽比长少b，则这个长方形的周长是( )
A、3b-2a B、3b+2a C、6b-4a D、6b+4a
5.A=x2-2x-3，b=2x2-3x+4，则A-B等于( )
A. x2-x-1 B. -x2+x+1 C. 3x2-5x-7 D. -x2+x-7
二. 填空
1. a2+7-2(10a-a2)=____________
2.一个多项式减去a2-b2等于a2+b2+c2,则原多项式是 .
3.已知某三角形的一条边长为m+n，另一条边长比这条边长大m-3,第三条边长等于2n-m,求这个三角形的周长为________
4.七年级⑵班同学参加数学课外活动小组的有x人，参加合唱队的有y人，而参加合唱队人数是参加篮球队人数的5倍，且每位同学最多只能参加一项活动，则三个课外小组的人数共 人.
5.粗心的周华在做多项式a3+2a+3加一个单项式时，误做成了减法，得到结果为a3+3，则要加的单项式为_______,正确的结果应是_________.
三. 计算
1.求多项式3x2+y2-5xy与-4xy-y2+7x2的和
2.计算：
⑴(3a2+2a+1)-(2a2+3a-5)
⑵已知A=x2-5x,B=x2-10x+5,求A+2B的值
3.先化简，再求值
(1)4(y+1)+4(1-x)-4(x+y)，其中，x= ，y= 。
(2)4a2b-[3ab2-2(3a2b-1)]，其中a=-0.1，b=1。
4.小红家一月份用电(2a-b)度，二月份比一月份多用(a+b)度，三月份比一月份的2倍少b度，则小家第一季度共用多少度电?当a=30,b=2时，小红家第一季度一共用了多少度电?
参考答案
一.选择 1.C 2. A 3.D 4.C 5.D
二.填空
1.3a2-20a+7 2. 2a2+c2 3.2m+4n-3 4.x+ y 5. 2a ;a3+4a+3
三.解答：
1.( 3x2+y2-5xy)+(-4xy-y2+7x2)=10x2-9xy
2. ⑴a2-a+6 ⑵(x2-5x)+ 2(x2-10x+5)=3x2-25x+10
3.(1)8-8x，6 (2)10a2b-3ab2-2，-1.6
4.(2a-b)+〔(2a-b)+(a+b)〕+〔2(2a-b)-b〕=9a-4b
当a=30,b=2时，9a-4b=262
自己在以前的练习册上找的，纯手打，望采纳。。。【咳咳~~】
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