А) 7x+13/12 - 5x+2/6=1 ( / - дробь)

б) 9x^2 - 100=0

в) (4 у-3) ^2 - (2 у+5) ^2=0

A) (7x+13) / 12 - (5x+2) / 6=1 |*12

7x+13-10x-4=12

-3x+9=12

-3x=3

x=-1

б) 9x²=100

x²=100/9

x₁=10/3 x₂=-10/3

в) (4y-3-2y-5) * (4y-3+2y+5) = 0

(2y-8) * (6y+2) = 0

2y-8=0 или 6y+2=0

y=4 y=-1/3