(x-2y-3z)(-x-2y+3z)
来源:百度知道 编辑:UC知道 时间:2024/05/10 14:12:24
计算要过程
(X-2Y-3Z)(-X-2Y+3Z)
=-(X-2Y-3Z)(X+2Y-3Z)
=-[(X-3Z)的平方-(2Y)的平方]
=-(X-3Z)⑵+4Y⑵=4Y⑵-(X-3Z)⑵
⑵代表平方
(x-2y-3z)(-x-2y+3z)
=[-2y-(3z-x)][-2y+(3z-x)]
=4y^2-(3z-x)^2
原式=-(x-2y-3z)(x+2y-3z)
=-(x-3z)^2-(2y)^2
=-(x-3z)^2-4y^2
=-x^2+6xz-9z^2-4y^2
(x-2y-3z)(-x-2y+3z)
=(-2y)^2-(x-3z)^2
=4y^2-x^2+6xz-9z^2
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