Question

Tìm số tự nhiên x biết (7𝑥 − 2³): 5 = 4

Answer 1

\(\Leftrightarrow7x-8=20\)

hay x=4

Answer 2

\(\left(7x-2^3\right):5=4\\ \left(7x-8\right):5=4\\ 7x-8=4.5\\ 7x-8=20\\ 7x=20+8\\ 7x=28\\ x=4\)

Answer 3

hay x=4

Answer 4

\(\text{(7𝑥 − 23): 5 = 4} =>\left(7𝑥−23)\right)=4.5=>\left(7𝑥−23\right)=20=>7x-8=20=>7x=28=>x=4\)

Answer 5

(7𝑥 − 2³): 5 = 4

(7𝑥 − 8): 5 = 4

(7𝑥 − 8)=5.4

7𝑥 − 8= 20

7x= 20+8

7x=28

x=28:7

x=4