a/b=3/5a=(3/5)b(a-b)/b=(a/b)-1=(3/5)-1=-2/5(2a+b)/(2a-b)=[2(3/5b)+b]/[2(3/5)b-b]=[(11/5)b]/[(-2/5)b]=-11/2=-5½
a/b=3/5a=3/5ba-b/b=(3/5b-b)/b=(-2/5b)/b=-2/5(2a+b)/(2a-b)=(3/5bx2+b)/(3/5bx2-b)=(11/5b)/(1/5b)=11
上面整体是分子吗