(1/2 + 4/5).(3/13 - 8/13) < x < 1 + 3/7 . 1/5 + 2 + 3
Ta có : (1/2 + 4/5).(3/13 - 8/13) = 13/10.(-5/13) = -1/2 = -35/70
1 + 3/7 . 1/5 + 2 + 3 = (1 + 2 + 3) + 3/7 . 1/5 = 6 + 3/35 = 213/35 = 426/70
=> -35/70 < x < 426/70
=> x = -34/70, -33/70, -32/70, ..., 425/70
Mình sửa lại rồi nha, nhớ vote cho mình ctrlhn nha