(1/5-1/4):(-1,6-3,3+5)=(0,2-0,25):0,1=-0,5
(-64)⁻⁴•8³/16⁻³ = (-2⁶)⁻⁴•(2³)³/(2⁴)⁻³ = 2⁻²⁴• 2⁹/ 2⁻¹² = 2⁻²⁴⁺⁹⁺¹² =2⁻³ =1/8
{x²+2x-9y²-6y=0⇒(x+1)²-(3y+1)²=0
{5x+6y+1=0
(x+1)²-(3y+1)²=0
(x+1)²=(3y+1)²
1)x+1=-3y-1
x=-3y-2
5(-3y-2)+6y+1=0
-15y-10+6y+1=0
-9y=9
y=-1
x=3-2=1
2)x+1=3y+1
x=3y
15y+6y+1=0
21y=-1
y=-1/21
x=-1/7
Ответ (1;-1);(-1/7;-1/21)