A)0,2^(x)<=1/25
b)(1,5)^(x)<2,25
c) 4^(5-2x)<=0,25
d) 0,4^(2x+1)>0,16
A) 0.2^(x)<=1/25
0.2^x<=0.2^(1/2)
x>=1/2
b) 1.5^x<2,25
1,5^x<1,5^2
x<2
c)4^(5-2x)<=0.25
4^(5-2x)<=4^(-1)
5-2x<=-1
x>=3
d) 0.4^(2x+1)>0.16
0.4^(2x+1)>0.4^2
2x+1<2
x<0.5
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