5. 1)7
(7^2)^3=7^6*7^10=7^16
(7^3)^5=7^15
7^16/7^15=7
(-1\2)^3-√(-1/2)^2 = -1/8-1/2 = -10/16 = -5/8
<span>{2x+у=3 => 2/y+y=3 => y^2+2=3y =>y^2-3y+2=0
{x*у=1 => x=1/y D=(-3)^2-4*1*2=1
y</span>₁=(3+√1)/2
y₁=2
y₂=(3-√1)/2
y₂=1
x₁=1/2
x₂=1
Ответ: x₁=1/2; y₁=2
x₂=1;y₂=1