Question

Tìm x

1/ (x - 1/2)^3 = 8

2/ (x - 1)^3 = 8/27

3/ (x - 2/3)^x = 1/81

 

Answer 1

1)

Ta có: \(\left(x-\frac{1}{2}\right)^3=8\Rightarrow\left(x-\frac{1}{2}\right)^3=2^3\)

\(\Rightarrow x-\frac{1}{2}=2\Rightarrow x=2+\frac{1}{2}=\frac{5}{2}\)

Answer 2

\(\left(x-1\right)^3=\frac{8}{27}\Rightarrow\left(x-1\right)^3=\left(\frac{2}{3}\right)^3\)

\(\Rightarrow x-1=\frac{2}{3}\Rightarrow x=\frac{2}{3}+1=\frac{5}{3}\)

Answer 3

x=5/3

Answer 4

\(\left(x-\frac{1}{2}\right)^3=8\)

\(\left(x-\frac{1}{2}\right)^3=2^3\)

\(x-\frac{1}{2}=2\)

\(x=2+\frac{1}{2}\)

\(x=\frac{5}{2}\)

Answer 5

1

(x - 1/2)^3 = 8 

(x - 1/2)^3 = 2^3

x - 1/2 =2

x = 5/2

2

( x - 1)^3 = 8/27

( x - 1)^3 = (2/3)^3

x - 1 = 2/3

x=5/3

3

(x-2/3)^x=(1/81)^1=(1/9)^2

Thay x=1; x=2 không có kết quả thỏa mãn

Nên không có x thỏa mãn

Answer 6

1/ (x-1/2)^3=8

    (x-1/2)^3=2^3

<=> x-1/2=2

       x= 2+1/2

       x= 4/2+1/2

       x=5/2

    (x-1)^3=8/27

(x-1)^3=(2/3)^3

<=>x-1=2/3

x= 2/3+1

x=2/3+3/3

x=5/3

(x-2/3)^x=1/81

x=