因式分解(x+y+z)²-(x-y-z)²因式分解
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(x+y+z)²-(x-y-z)²
=(x+y+z+x-y-z)(x+y+z-x+y+z)
=3x(2y+2z)
=6x(y+z)
=(x+y+z+x-y-z)(x+y+z-x+y+z)
=3x(2y+2z)
=6x(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)]
=(x+y+z+x-y-z)(x+y+z-x+y+z)
=2x·2(y+z)
=4x(y+z)
=[(x+y+z)+(x-y-z)][(x+y+z)-(x-y-z)]
=(x+y+z+x-y-z)(x+y+z-x+y+z)
=2x·2(y+z)
=4x(y+z)
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