1)27^2х=81
(3^3)^2х=3^4
3^6х=3^4
6х=4
Х6/4
Х=3/2
Х=1,5
2)4^(х-3)=(1/16)^(2х+5)
4^(х-5)=(4^(-2))^(2х+5)
Х-5=-2*(2х+5)
Х-5=-4х-10
Х+4х=-10+5
5х=-5
Х=-1
3)25^(х-4)<=5
(5^2)^(х-4)<=5
2*(х-4)<=1
2х-8<=1
2х<=1+8
2х<=9
Х<=9/2
Х<=4,5
(-бесконечности;4,5]
4)9^(х-10)*3^(х+9)=(3^2)^(х-10)*3^(х+9)=3^2(х-10)+(х+9)=
=3^(2х-20+х+9)=3^(3х-11)
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Answers & Comments
1)27^2х=81
(3^3)^2х=3^4
3^6х=3^4
6х=4
Х6/4
Х=3/2
Х=1,5
2)4^(х-3)=(1/16)^(2х+5)
4^(х-5)=(4^(-2))^(2х+5)
Х-5=-2*(2х+5)
Х-5=-4х-10
Х+4х=-10+5
5х=-5
Х=-1
3)25^(х-4)<=5
(5^2)^(х-4)<=5
2*(х-4)<=1
2х-8<=1
2х<=1+8
2х<=9
Х<=9/2
Х<=4,5
(-бесконечности;4,5]
4)9^(х-10)*3^(х+9)=(3^2)^(х-10)*3^(х+9)=3^2(х-10)+(х+9)=
=3^(2х-20+х+9)=3^(3х-11)