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已知x/2+y/2-z/2=3,求x^2+2xy+y^2-2xz-2yz+z^2
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已知x/2+y/2-z/2=3,求x^2+2xy+y^2-2xz-2yz+z^2
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答案和解析
X+Y-Z=6
(X+Y-Z)^2=36
所以x^2+2xy+y^2-2xz-2yz+z^2 =36
(X+Y-Z)^2=36
所以x^2+2xy+y^2-2xz-2yz+z^2 =36
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