Question

28+(81-3.x):4=40

Answer 1

28 + (81 - 3.x) : 4 = 40

(81 - 3.x) : 4 = 12

81 - 3.x = 48

3.x = 33

x = 11

Answer 2

28 + (81 - 3.x) : 4 = 40

(81 - 3.x) : 4 = 12

81 - 3.x = 48

3.x = 33

x = 11

học tốt

Answer 3

(81-3.x):4=40-28=12

81-3.x=12.4=48

3.x=81-48=33

x=33:3=11

vậy x=11