Question

tìm x biết:

a) (2x+1)³=125

Answer 1

Ta có: \(^{\left(2x+1\right)^3=125}\)
=> \(\left(2x+1\right)^3=5^3\)(vì \(5^3\)= 125)
=> 2x+1 = 5

=> 2x = 5-1 = 4

=> x = 4:2
=>x = 2

Vậy x = 2

Answer 2

\(\left(2x+1\right)^3=125\)

\(\left(2x+1\right)^3=5^3\)

\(\Rightarrow2x+1=5\)

\(\Rightarrow2x=4\)

\(\Rightarrow2\)

Answer 3

[2x+1]³=125

<=>[2x+1]³

<=>2x+1=5

<=>2x=4

<=>x = 2

Answer 4

\(\left(2x+1\right)^3=125\)

\(\left(2x+1\right)^3=5^3\)

2x+1=5

2x=5-1

2x=4

x=4:2

x=2

vậy \(x=2\)