ab x 5 = 1ab
ab x 5 = 100 + ab
ab x 5 - ab x 1 =100
ab x ( 5 -1) = 100
ab x 4 = 100
ab = 100 : 4
ab = 25
vậy a=2 b = 5
1ab : ab = 5
ab x 5 = 1ab
ab x 5 = 100 + ab
ab x 5 - ab = 100
ab x 5 = 100
ab = 100 : 5
ab = 20
1ab : ab = 5
ab x 5 = 1ab
ab x 5 = 100 + ab
ab x 5 - ab = 100
ab x 4 = 100
ab = 100 : 4
ab = 25
1ab : ab = 5
1ab = 5 x ab
100 + ab = 5 x ab
100 = 4 x ab ( 2 vế bớt ab )
ab = 100 : 4
ab = 25 => a = 2 ; b = 5
Tk mk nha
Ta có: ab+5=1ab
Ab+5=100+ab
ab+5-ab=100
Ab+4=100
Ab =100-4 ab=96
