把6x(x-y)的平方+3(y-x)的立方分解因式我知道答案是6x(x-y)^2+3(y-x)^3=6x(x-y)^2-3(x-y)^3=3(x-y)^2[2x-(x-y)]=3(x-y)^2(x+y)可为什么=6x(x-y)^2-3(x-y)^3=3(x-y)^2[2x-(x-y)]
问题描述:
把6x(x-y)的平方+3(y-x)的立方分解因式
我知道答案是6x(x-y)^2+3(y-x)^3
=6x(x-y)^2-3(x-y)^3
=3(x-y)^2[2x-(x-y)]
=3(x-y)^2(x+y)可为什么=6x(x-y)^2-3(x-y)^3
=3(x-y)^2[2x-(x-y)]
答
6x(x-y)²-3(x-y)³
=6x(x-y)²-3(x-y)²(x-y)
提取公因式=3(x-y)²[2x-(x-y)]
答
(y-x)^3=(-1)(-1)^3(y-x)^3
=(-1)(x-y)^3
=-(x-y)^3
最后的结果是3(x-y)^2(x+y),而不是3(x-y)^2[2x-(x-y)]
答
提取公因式3(x-y) ^2,那么 6x(x-y)^2还剩下2x,3(x-y)^ 3 还剩下(x-y).详细应该是这样:将 6x(x-y)^2看做2x乘以 3(x-y) ^2.同样,讲 3(x-y)^ 3看做(x-y) 乘以[3(x-y) ^2]