已知4x-3y-6z=0,x+2y-7z=0,则2xy+3yz-6zx / x^2+5y^2+7z^2=_______
2个回答
由4x-3y-6z=0,x+2y-7z=0 解得x=3z y=2z代入2xy+3yz-6zx / x^2+5y^2+7z^2
得原式=0
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