a, 219 - 7 . (x + 1) = 100
7 . (x + 1) = 219 - 100
7 . (x + 1) = 119
x + 1 = 17
x = 16
Vậy x = 16
b, (3x - 6) . 3 = 36
3x - 6 = 12
3x = 18
x = 6
Vậy x = 6
c, 716 - (x - 143) = 659
x - 143 = 716 - 659
x - 143 = 57
x = 200
Vậy x = 200
d, 30 - {4 . (x - 2) + 15} = 3
4 . (x - 2) + 15 = 27
4 . (x - 2) = 12
x - 2 = 3
x = 5
Vậy x = 5
e, {(8x - 12) : 4} x 3³ = 3^6
(8x - 12) : 4 = 3^6 - 3³
(8x - 12) : 4 = 3³
(8x - 12) : 4 = 27
8x - 12 = 108
8x = 120
x = 15
Vậy x = 15
Gửi bạn nhé!