已知4x-y-4z=0 x+y-6z=0,那么2x*+3y*+6z*/ x*+5y*+7z*的值是多少
1个回答
4x-y-4z=0
x+y-6z=0 =2x=y=4z
2x*+3y*+6z*/x*+5y*+7z*=62/91
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