[124-(20-4x)] :30+7=11

2 câu trả lời

[124-(20-4x)]:30+7=11

[124-(20-4x)]:30=11-7

[124-(20-4x)]:30=4

124-(20-4x)=4.30

124-(20-4x)=120

20-4x=124-120

20-4x=4

4x=20-4

4x=16

x=16:4

x=4

Vậy x=4

#dtkc

[124-(20-4x)]:30+7=11

[124-(20-4x)]:30=11-7

[124-(20-4x)]:30=4

124-(20-4x)=4.30

124-(20-4x)=120

20-4x=124-120

20-4x=4

4x=20-4

4x=16

x=16:4

x=4

 Vy x=4