(x - 1)⁵ = -32

=> (x - 1)⁵ = (-2)⁵

=> x - 1 = -2

=> x = -2 + 1

=> x = -1

Vậy ...

\(\left(x-1\right)^5=-32\)

\(\Rightarrow\left(x-1\right)^5=-2^5\)

\(\Rightarrow x-1=-2\)

\(\Rightarrow x=-2+1=-1\)

Vậy x = -1 

\(\left(\times-1\right)^5=-32\)

\(\left(\times-1\right)^5=\left(-2\right)^5\)

\(\times-1=-2\)

\(\times=-1\)

A=1/2^2+1/3^2+...+1/10^2

=>A<1-1/2+1/2-1/3+...+1/9-1/10=1-1/10<1

Tách ra từng câu rồi đăng thành câu hỏi nhé

Bài 3: 

a: \(x=\dfrac{1}{4}-\dfrac{2}{13}=\dfrac{13}{52}-\dfrac{8}{52}=\dfrac{5}{52}\)

b: \(\dfrac{x}{3}=\dfrac{2}{3}-\dfrac{1}{7}\)

nên \(x\cdot\dfrac{1}{3}=\dfrac{14}{21}-\dfrac{3}{21}=\dfrac{11}{21}\)

hay \(x=\dfrac{11}{21}:\dfrac{1}{3}=\dfrac{11}{7}\)

8. a)(231-39)-231=39-(231-231)=39-0=39

Bài 11: 

a: =x+51-56+24=x+19

b: =-65-x-27+26=-x-56

a, (231 - 39) - 231

= 39 - (231 - 231) 

= 39 - 0

= 39