由个位数*3所得的数的个位是1,可推出,E=7,ABCDE1=ABCD71,1ABCDE=1ABCD7,同理可推D=5,ABCD71=ABC571,1ABCD7=1ABC57同理可推C=8,ABC571=AB8571,1ABC57=1AB857同理可推B=2,AB8571=A28571,1AB857=1A2857同理可推A=4,A285...