Question

a) 2^x . 8 = 512

b) ( 2x + 1 )³ = 729

 

Answer 1

câu a

2 mũ x = 512 chia 8

2 mũ x =64

2 mũ x = 2 mũ 6

suy ra x =6

Answer 2

2^x.8=512

2^x=512:8

2^x=64

2^x=2⁶

=>x=6

(2x+1)³=729

(2x+1)³=9³

2x+1=9

2x=9-1

2x=8

x=8:2

x=4

Answer 3

a) 2^x . 8 = 512

2^x = 512 : 8

2^x = 64

2^x = 2⁶ 

x = 6

b) ( 2x + 1 )³ = 729

( 2x + 1)³ = 9³

2x + 1 = 9

2x = 9 - 1 

2x = 8

x = 8 : 2

x = 4

Answer 4

a) \(2^x.8=512\)

\(2^x=512:8=64\)

\(\Rightarrow x=6\)

b) \(\left(2x+1\right)^3=729\)

Ta có: \(9^3=729\)

\(\Rightarrow\left(2x+1\right)=9\)

\(2x=9-1=8\)

\(x=8:2=4\)

\(\Rightarrow x=4\)