x(x+y)(x-y)-x(x+y)的平方

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x(x+y)(x-y)-x(x+y)的平方x(x+y)(x-y)-x(x+y)的平方x(x+y)(x-y)-x(x+y)的平方x(x+y)(x-y)-x(x+y)的平方=(x^2-xy)(x+y)-(

x(x+y)(x-y)-x(x+y)的平方
x(x+y)(x-y)-x(x+y)的平方

x(x+y)(x-y)-x(x+y)的平方
x(x+y)(x-y)-x(x+y)的平方
=(x^2-xy)(x+y)-(x^2+xy)(x+y)
=(x^2-xy-x^2-xy)(x+y)
=-2xy(x+y)

x(x+y)(x-y)-x(x+y)²
=x(x²-y²)-x(x²+2xy+y²)
=x^3-xy²-x^3-2x²y-xy²
=-2xy²-2x²y

x(x的平方-y的平方)-x(x的平方+2xy+y的平方)
x的三次方-xy的平方-x的平方-2x的平方y-xy的平方
-2xy的平方-2x的平方y