作业帮计算（x+2y-3z)^2+（x-2y+3z)(x+2y-3z)
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计算（x+2y-3z)^2+（x-2y+3z)(x+2y-3z)
计算（x+2y-3z)^2+（x-2y+3z)(x+2y-3z)
计算（x+2y-3z)^2+（x-2y+3z)(x+2y-3z)
（x+2y-3z)^2+（x-2y+3z)(x+2y-3z)
=(x+2y-3z)(x+2y-3z+x-2y+3z)
=(x+2y-3z)2x
=2x2+4xy-6xz
原式=x^2+2x(2y-3z)+(2y-3z)^2+x^2-(2y-3z)^2
=2x^2+4xy-6xz
（x+2y-3z)^2+（x-2y+3z)(x+2y-3z)
=（x+2y-3z)[（x+2y-3z)+（x-2y+3z)]
=（x+2y-3z)*2x
（x+2y-3z)^2+（x-2y+3z)(x+2y-3z)
=（x+2y-3z)（x+2y-3z+x-2y+3z)
=2x（x+2y-3z)
（x+2y-3z)^2+（x-2y+3z)(x+2y-3z)
=（x+2y-3z)(x+2y-3z+x-2y+3z)
=2x(x+2y-3z)
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