1ab x ( 25 + 1 ) = 2000 + 1ab
1ab x 125 + 1ab = 2000 + 1ab
1ab x 125 = 2000
1ab = 2000 : 125 = 160
160 x 125 = 20160
Vậy a = 6 ; b = 0.
1ab x ( 125 + 1 ) = 20000 + 1ab
1ab x 125 = 20000 ( cùng bớt 1ab )
1ab = 20000 : 125
1ab = 160
100 + ab = 160
ab = 160 - 100
ab = 60
vậy a = 6 ; b = 0
Đ/S : ................
1ab x 126 = 201ab
(100 + ab) x 126 = 20100 + ab
12600 + ab x 126 = 20100 + ab
ab x 126 - ab = 20100 - 12600
ab x (126 - 1) = 7500
ab x 125 = 7500
ab = 7500 : 125
ab = 60
=> a = 6, b = 0