已知{4x-5y+2z=0 x+4y-3z=0 求x:y:z的值
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已知x+4y-3z=0,4x-5y+2z=0,则x:y:z
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已知{x+4y-3z=0,4x-5y+2z=0,则2x-y+3z分之3y-5z=?
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已知x,y,z,满足方程组x-2y+z=0,7x+4y-5z=0