八上启东数学题....答对加分
\u542f\u4e1c\u4e2d\u5b66\u516b\u5e74\u7ea7\u4e0a\u6570\u5b66\u9898\u5df2\u77e5 Y=\u221a(2X-1) - \u221a(1-2X )+8X\uff0c\u6c42\u221a(4X+5Y-6)\u7684\u5e73\u65b9\u6839
\u89e3\uff1a\u56e0\u4e3aY=\u221a(2X-1) - \u221a(1-2X )+8X
\u8981\u4f7f\u221a(2X-1) \u3001\u221a(1-2X )\u6709\u610f\u4e49
\u6545\uff1a2X-1\u22650\uff0c1-2X\u22640
\u6545\uff1aX\u22651/2\uff0cX\u22641/2
\u6545\uff1aX=1/2
\u6545\uff1aY=4
\u6545\uff1a\u221a(4X+5Y-6)=4
\u6545\uff1a\u221a(4X+5Y-6)\u7684\u5e73\u65b9\u6839\u662f\u00b12
2*5=10
3*5=15
2*3*3=18
2*2*2*3=24
24*3*5=360
\u81f3\u5c11360\u4eba
AB＋AC<=PB＋PC
做AD＝AC，易证三角形ADP全等ACP，所以PC＝PD，因此PB＋PC＝PB+PD>=DB=AD+AB=AB+AC
没那本书
哎，没出错吧
绛旓細浣滀笟浜掑姪缁勪笂搴旇鏈
绛旓細1/2+1/4+1/8+...+1/2鐨刵娆℃柟 =1-1/2鐨刵娆℃柟
绛旓細11.鍥涜竟褰㈠唴瑙掑拰=360搴︼紝鎵浠ヨ1+瑙2+瑙3+瑙4灏辨槸360搴 12鍥炬病鐪嬫竻 13.鍚11T瑙扖BD=360-90-30-20=220搴
绛旓細DCDCA Y=4-2X 1 5 16 姝ｈ礋5 姝ｈ礋3 鍑芥暟瀹氫箟 M=19+N 1<=N<=25涓攏涓烘鏁存暟
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绛旓細瑙:(1)鏍规嵁棰樻剰鍙垪涓嶇瓑寮,涓 15x+30(24-x)鈮540 瑙ｅ緱 x鈮12 鐢变簬绉嶆鐨勮崏鑾撴垨瑗跨孩鏌垮崟绉嶅啘浣滅墿鐨勬诲瀯鏁颁笉浣庝簬10鍨,鍙堜笉瓒呰繃14鍨,鎵浠 12鈮鈮14 鎵浠ュ叡鏈3绉嶇妞嶆柟妗 鏂规涓:绉嶆鑽夎帗12鍨,绉嶆瑗跨孩鏌12鍨 鏂规浜:绉嶆鑽夎帗13鍨,绉嶆瑗跨孩鏌11鍨 鏂规涓:绉嶆鑽夎帗14鍨,绉嶆瑗跨孩鏌10鍨 (2)...
绛旓細鏈涢噰绾筹紒锛侊紒
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