通分1/2x,2/3y3/2bc,2/5c21/a(x-y),1/b(y-x)1/b-a,1/a2-b21/x2-2x+1,1/x2-1a/a2-b2,b/a2+2ab+b2x+2y/x2-y2,x-y/2x2-4xy+2y2a-2b/a2-4ab+4b2,a+b/a2+2ab+b2x-y/a-x+y/aa-1/3ab+a+2/3ab3x-1/2x-3+x+2/3-2xa+b/a-b+2a/b-a3/a+b+5/ax/x-3-3/x+34a/5(a-3)-3a/2(a-3)a/a-b-b

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