（x+y+z）²-（x-y-z）²等于多少要步骤

（x+y+z）²-（x-y-z）²等于多少要步骤
（x+y+z）²-（x-y-z）²等于多少要步骤

（x+y+z）²-（x-y-z）²等于多少要步骤
(x+y+z)²-(x-y-z)²
=[(x+y+z)-(x-y-z)][(x+y+z)+(x-y-z)]
=(2y+2z)(2x)
=4x(y+z)
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（x+y+z）²-（x-y-z）²
=(x+y+z+x-y-z)(x+y+z-x+y+z)
=4x(y+z)

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