利用因式分解求x(x+y)(x-y)-x(x+y)的二次方 5
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x(x+y)(x-y)-x(x+y)的二次方
=x(x+y)[(x-y)-(x+y)]
=x(x+y)(-2y)
=-2xy(x+y)
=x(x²-y²)-x(x²+2xy+y²)
=x³-xy²-x³-2x²y-xy²
=-2xy²-2x²y
= -2xy(x+y)
=x(x+y)[(x-y)-(x+y)]
=x(x+y)(-2y)
=-2xy(x+y)
=x(x²-y²)-x(x²+2xy+y²)
=x³-xy²-x³-2x²y-xy²
=-2xy²-2x²y
= -2xy(x+y)
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