Question

Bài 2: Tìm n

(xⁿ)² bằng x¹⁸

 

Answer 1

Ta có :

(xⁿ)²=x¹⁸

=> x²ⁿ=x^2.9

=> x².xⁿ=x².x⁹

=> xⁿ=x⁹

=> n=9 

:) thế thôi

Answer 2

( xⁿ)² = x¹⁸

hay x^nx2 = x¹⁸

Suy ra nx2 = 18

Vậy n = 9.

Answer 3

\(\left(x^n\right)^2\)=\(x^{18}\)\(\Rightarrow x^n=x^9\)  \(\Rightarrow x=9\)