1、化简或计算:(x-y+4xy/x-y)×(x+y-4xy/x-y)2、如图,A、B两个村庄分别位于小河的两侧,现准备在小河上修建一座桥,方便两村庄居民的交往,问桥修建在何处时,两村庄居民先走的路程最近?A.M N-
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1、化简或计算:(x-y+4xy/x-y)×(x+y-4xy/x-y)
2、如图,A、B两个村庄分别位于小河的两侧,现准备在小河上修建一座桥,方便两村庄居民的交往,问桥修建在何处时,两村庄居民先走的路程最近?
A.
M N
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B.
代数题详解,几何题有画法就可以了
答得好视情况追加分数
第一题打错了,应该是[X-Y+4XY/(X-Y)][X+Y-4XY/(X-Y)]
第二题,嗯……桥必须是垂直于小河的
再加一题:分解因式:A4+B4+C4-2A2C2-2B2C2-2A2C2(跟在字母后面的数字是指立方)
1 原式=(x*x-xy-xy+y*y+4xy/x-y)(x*x-4xy-y*y/x-y) =(x-y)*(x-y)(x*x-4xy-y*y)/(x-y)(x-y)=x*x-4xy-y*y 2将军饮马 3原式=(a-b-c-2bc)(a-b-c+2bc)
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{[(x根号x)+(x根号y)]/(xy-y2)}-[x+(根号xy)+y]/[(x根号x)-(y根号y)] y2是指y的平方;求上述式子的值.{[(x根号x)+(x根号y)]/(xy-y2)}-[x+(根号xy)+y]/[(x根号x)-(y根号y)] 化简或计算。
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