А)16^(1/2)+27^(-1/3)+81^(3/4)-8^(5/3)=4^(2/2)+3^(-3/3)+3^(12/4)-2^(15/3)=4+1/3+3^3-2^5=4+1/3+27-32=1/3-1=-2/3
б) 16^0.4*8^(1/3) 2^1.6*2^(3/3)
------------------- = ------------------ =2^(1.6+1-0.6)=2^2=4
4^0.3 2^0.6
S₁₁ = (a₁ + a₁₁)*11/2
22 = (a₁ + 92)*11/2
a₁ + 92 = 4
a₁ = -88
a₁₁ = a₁ + 10d
92 = -88 + 10d
10d = 180
d = 18
1. х+3=8
х=5
Корінь 5
2. 2х=9
х=4.5
Корінь 4.5