z不等于0,且4x-7y-5z=0,2x-y-z=0求x/y
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z不等于0,且4x-7y-5z=0,2x-y-z=0求x/yz不等于0,且4x-7y-5z=0,2x-y-z=0求x/yz不等于0,且4x-7y-5z=0,2x-y-z=0求x/y,2x-y-z=0推
z不等于0,且4x-7y-5z=0,2x-y-z=0求x/y
z不等于0,且4x-7y-5z=0,2x-y-z=0求x/y
z不等于0,且4x-7y-5z=0,2x-y-z=0求x/y
,2x-y-z=0推出 z=2x-y
带入式子一中
4x-7y=5(2x-y)
化简得到,x/y=-1/3
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