Question

9^7-x=81^2x решите уравнение

Answer 1

9^(7 - x) = 81^(2x)
9^(7 - x) = 9^(4x)
7 - x = 4x
5x = 7
x = 7 : 5
x = 1.4

Answer 2

9^(7-х)=81^2х
9^(7-х)=(9^2)^2х
9^(7-х)=9^4х
7-х=4х
5х=7
х=7/5
х=1,4