（X-Y）/13=Y/7
7X-7Y=13Y
7X=20Y
(X+Y)/Y=X/Y +1=20/7 +1= 27/7
设X=6K,Y=4K,Z=3K
（X+3Y）/(3Y-2Z)=18K/6K=3
1.（X-Y）/13=Y/7问（x+y）/y=?.2.x/6=y/4=z/3(x.z.y不为0)则（X+3Y）/3Y-2
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