x的平方乘(x-y)+(y-x)等于几

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x的平方乘(x-y)+(y-x)等于几

x的平方乘(x-y)+(y-x)等于几
x的平方乘(x-y)+(y-x)等于几

x的平方乘(x-y)+(y-x)等于几
x²(x-y)+(y-x)
=x²(x-y)-(x-y)
=(x-y)(x²-1)
=(x-y)(x+1)(x-1)

x*x[(x-y)+(y-x)]
=x*x*x-x*x*y+x*x*y-x*x*x
=0

(x^2-1`)(x-y)=(x-1)(x+1`)(x-y)