Question

Выполните действие. 7ой класс.

Answer 1

5x/(x-3)-2/(x+3)[5x(x+3)-2(x-3)]/(x²-9)=(5x²+15x-2x+6)/(x²-9)=(5x²+13x+6)/(x²-9)=
=(5x+3)(x+2)/(x²-9)
5x²+13x+6=5(x+2)(x+3/5)=(5x+3)(x+2)
D=169-120=49
x1=(-13-7)/10=-2
x2=(-13+7)/10=-3/5