Question

[nguyễn hà linh]

tìm x:

a) 1170 : (x -13) = 339 - 3 . 10² 
b) (x¹⁰⁰)¹⁰ . x⁹⁹⁹ = x 

Answer 1

[Nguyễn Lê Phước Thịnh]

a: =>1170:(x-13)=39

=>x-13=1170/39=30

=>x=43

b: \(\Leftrightarrow x^{1000}\cdot x^{999}-x=0\)

=>\(x\left(x^{1998}-1\right)=0\)

=>\(\left[{}\begin{matrix}x=0\\x^{1998}-1=0\end{matrix}\right.\Leftrightarrow x\in\left\{0;1;-1\right\}\)