若2x-y/x+2y=5,求代数式12x-6y/x+2y-x+2y/2x-y +3的值
1个回答
2x-y/x+2y=5,
12x-6y/x+2y-x+2y/2x-y +3
=6(2x-y)/(x+2y)-(x+2y)/(2x-y)+3
=6*5-1/5+3
=33-1/5
=32又4/5
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