Question

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

Đầy đủ cách làm

 

Answer 1

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

\(\left(81-3.x\right):4=40-28\)

\(\left(81-3.x\right):4=12\)

\(81-3.x=12.4\)

\(81-3.x=48\)

\(3.x=81-48\)

\(3.x=33\)

\(x=33:3\)

\(x=11\)

Answer 2

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

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

(81-3.x):4=12

81-3.x=12.4

81-3.x=48

3.x=81-48

3.x=33

x=33:3

x=11