№1. 2cd4-3cd4+7cd3=7cd3-cd4=cd3(7-cd)
№3 2ab3-7ab3+5ab3=0
Х=0 у=0-2/3=-2/3
х=2 у=2-2/3=1 1/3
х=-1/3 у=-1/3-2/3=-1
5=х-2/3
х=5+2/3
х=5 2/3
1) 2^(3x)<2^(1/5) 3x<1/5 x<1/15.
2) (1/8)^((x+1)/2)>4 2^(-3*(x+1))>2^2 -3x-3>2 3x<5 x<5/3
3) (1/49)^(-x/2)≤7 7^(x)≤7¹ x≤1
4)3^((2x+1)/5)<3^(-1/3) (2x+1)/5<-1/3 2x+1<-5/3 2x<-8/3 x<-4/3 x<-1¹/₃.
(1,3m²+4n²)²=(1,3m²)²+2*1,3m²*4n²+(4n²)²=
=1,69m^4+10,4m²n²+16n^4