Ответ:

a) x/(x-y) и (5x²-5xy)/(x-y)

b) 7y/(x+y) и (x²-y²)/(x+y)

c) (9a³+81a²)/(a+9) и a²/(a+9)

d) (25-b²)/(5+b) и 8b/(5+b)

Объяснение:

a) x/(x-y) и 5x│*(x-y)

x/(x-y) и (5x²-5xy)/(x-y)

b) 7y/(x+y) и (x-y)│*(x+y)

7y/(x+y) и (x²-y²)/(x+y)

c) 9a²│*(a+9) и a²/(a+9)

(9a³+81a²)/(a+9) и a²/(a+9)

d) (5-b)│*(5+b) и 8b/(5+b)

(25-b²)/(5+b) и 8b/(5+b)