x + 7 . 8 - 2 = 72
x + 56 - 2 = 72
x + 56 = 72 + 2 = 74
x = 72 - 56 = 18
x + 7 x 8 - 2 = 72
x + 7 x 8 = 72 - 2
x + 7 x 8 = 70
x + 56 = 70
x = 70 - 56
x = 14
x + 7 x 8 - 2 = 72
x + 56 - 2 = 72
x + 54 = 72
x = 18
Vậy x = 18
x + 7 x 8 - 2 = 72
x = 72 + 2 - ( 7 x 8 )
x = 74 - 56
x = 18
Đ/s: ...
x+7x8-2=72
=>x+56-2=72
=>x+54=72
=>x=72-54
=>x=18
x + 7 x 8 - 2 = 72
x + 7 x 8 = 72 - 2
x + 7 x 8 = 70
x + 56 = 70
x = 70 - 56
x = 14
x + 7 x 8 - 2 = 72
x + 7 x 8 = 72 + 2
x + 7 x 8 = 74
x + 56 = 74
x = 74 - 56
x = 18
Câu này đúng đấy câu kia sai đó nha .
x + 7 x 8 - 2 = 72
x + 7 x 8 = 72 + 2
x + 7 x 8 = 74
x + 56 = 74
x = 74 - 56
x = 18
x + 7 x 8 - 2 = 72
x + 7 x 8 = 72 - 2
x + 7 x 8 = 70
x + 56 = 70
x = 70 - 56
x = 14
x + 7 x 8 - 2 = 72
x + 56 - 2 = 72
x + 56 = 72 - 2
x + 56 = 70
x = 70 - 56
x = 24
x + 7 x 8 - 2 = 72
x + 7 x 8 = 72 + 2
x + 7 x 8 = 74
x + 56 = 74
x = 74 - 56
x = 18