作业帮计算(x+2y-z)(2y+z-x)
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/17 22:47:38
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计算(x+2y-z)(2y+z-x)
计算(x+2y-z)(2y+z-x)
计算(x+2y-z)(2y+z-x)
=[2y+(x-z)][2y-(x-z)]
=(2y)²-(x-z)²
=4y²-x²+2xz-z²
=2xy+xz-x^2+4y^2+2yz-2xy-2zy-z^2+xz
=-x^2+4y^2-z^2+2xz
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