Question

x:18=9:2x срочно надо помагите

Answer 1

Х/18=9/2х     х≠0
2х²=162
х²=81
х₁=9
х₂=-9

Answer 2

$x*2x=18*9\\ 2x^2 =162\\ x^2=81\\ x= \sqrt{81}=9$