tìm x a ) 13/12 x x - 5/6 = 4/3 b ) 9/2 - x = 4/3 - 1/2 ..................................................................... ................................................................... .................................................................... ..................................................................... .................................................................... .................................................................... ................................................................... ...................................................................... ................................................................... ............................................................................ chú ý hộ mình : ở phần a là dấu x đúng trước chữ x nhé