Question

Tìm x 

a, x= (3,8)³ : (-3,8)²

b, \(\left(\frac{27}{46}\right)^9.x=\left(\frac{3}{45}\right)^{21}\)

Answer 1

Trả lời :

a, x = (3,8)³ - (- 3,8)²

=> x = (3,8)³ - (3,8)²

=> x = (3,8)^{3 - 2}

=> x = 3,8

Answer 2

Bài làm:

a) \(x=\left(3,8\right)^3\div\left(-3,8\right)^2\)

\(\Leftrightarrow x=\left(3,8\right)^3\div\left(3,8\right)^2\)

\(\Rightarrow x=3,8\)

b) đề sai sai ý bn

Answer 3

a, Ta có 

    \(x=\left(3,8\right)^3:\left(-3,8\right)^2\)

         \(=\left(3,8\right)^3:\left(3,8\right)^2\)

       \(=3,8\)

Answer 4

x=(3,8)^3:(3,8)^2

x=(3,8)^3-^2

x=(3,8)