16x²-25>0
(4x-5)(4x+5)>0
x=1,25 U x=-1,25
x∈(-∞;-1,25) U (1,25;∞)
2х-1+6-3х=2
2х-3х=2+1-6
-х=-3
Х=3
Ответ:3.
1/3=16/48; 1/48
b1=16
b5=1
b5=b1*q^4
q^4=b5/b1=1/16
q=1/2
b2=16*1/2=8
b3=8/2=4
b4=4/2=2
16/48; 8/48; 4/48; 2/48; 1/48
1/3; 1/6; 1/12; 1/24; 1/48
(2^2+1)*2^n-2/2^n-4=(4+1)*2^2=5*2^2=5*4=20