Question

Tìm x:

a, ( x - 4 ) mũ 3 = 8

b, x/2 = 6/10

Answer 1

a) \(\left(x-4\right)^3=8\)

\(\Leftrightarrow x-4=2\Leftrightarrow x=6\)

b) \(\frac{x}{2}=\frac{6}{10}\)

\(\Leftrightarrow x=\frac{2\cdot6}{10}=\frac{12}{10}=1,2\)

Answer 2

a) (x - 4)³ = 8

=> (x - 4)³ = 2³

=> x - 4 = 2

=> x = 2 + 4 = 6

Vậy x = 6

b) \(\frac{x}{2}=\frac{6}{10}\)

=> \(\frac{x}{2}=\frac{3}{5}\)

=> 5.x = 2.3 = 6

=> \(x=\frac{6}{5}\)

Vậy \(x=\frac{6}{5}\)

Answer 3

\(\left(x-4\right)^3=8\)

\(\left(x-4\right)^3=2^3\)

\(\Rightarrow x-4=2\)

\(\Rightarrow x=2+4\)

\(\Rightarrow x=6\)

\(\frac{x}{2}=\frac{6}{10}\Rightarrow\frac{x}{2}=\frac{3}{5}\Rightarrow x=\frac{3.2}{5}=\frac{6}{5}=1,2\)

 

Answer 4

a, ( x-4)³ = 8

Ta có: 8= 2³

=> ( x- 4) ³= 2³

=> x- 4= 2

=> x= 2+ 4

=> x= 6

b, \(\frac{x}{2}=\frac{6}{10}\)

=> x= \(\frac{6}{10}.2=\frac{12}{10}=\frac{6}{5}\)

Vậy x= 6/5

Answer 5

a) \(\left(x-4\right)^3=8\)

\(\Rightarrow\left(x-4\right)^3=2^3\)

\(\Rightarrow x-4=2\)

\(\Rightarrow x=6\)

Vậy \(x=6\)

b) \(\frac{x}{2}=\frac{6}{10}\)

\(\Rightarrow10x=2.6\)

\(\Rightarrow10x=12\)

\(\Rightarrow x=\frac{12}{10}=\frac{6}{5}\)

Vậy \(x=\frac{6}{5}\)