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