4x-3y-6z=0.(1) x+2y-7z=0.(2) (2)*4-(1),得 11y-22z=0 y=2z (1)*2+(2)*3,得 11x-33z=0 x=3z 把X=3Z,y=2z代入 2x^2+3y^2+6z^2/x^2+5y^2+7z^2 =[2*(3z)^2+3*(2z)^2+6z^2]/[(3z)^2+5*(2z)^2+7z^2] =36z^2/(36z^2) =1...
已知:4x-3y-6z=0,x+2y-7z=0,求值2x²+3y²+6z²/x²
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