1.设被除数是X,则除数为(X-12)/20.列式: X+(X-12)/20+20+12=533 得:X=3344/7 则除数为 163/7 2.设除数为X,被除数为(20X+12) (20X+12)+X+20+12=533 X=163/7 除数为163/7,被除数为3344/7