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(x+2y-z)(x-2y+z)=
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(x+2y-z)(x-2y+z)=
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答案和解析
(x+2y-z)(x-2y+z)
=[x+(2y-z)][x-(2y-z)]
=x^2-(2y-z)^2
=x^2-4y^2+4yz-z^2
=[x+(2y-z)][x-(2y-z)]
=x^2-(2y-z)^2
=x^2-4y^2+4yz-z^2
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