Question

СРОЧНООООО!!!!!!!!!!!

Answer 1

Ответ:

Объяснение:

1.  (a/b² - 1/a) : (1/b+1/a) = (a²-b²)/ab² : (a+b)/ab = (a+b)(a-b)/ab² *ab/(a+b)=

= (a-b)/b.

2.  (y-3)/(y+3) * (y+y²/(3-y)) = (y-3)/(y+3) * (3y-y²+y²)/(3-y) = -3y/(y+3).