1a)
(x+y)^(-5)*(x+y)^2 (x+y)^(-5+2) (x+y)^(-3)
----------------------- = --------------------- = ------------ =1
(x+y)^(-2)*(x+y)^(-1) (x+y)^(-2+(-1)) (x+y)^(-3)
1b)
²√x ÷ x⁻⅔ = x^(1/2): x^(-2/3) =x^(1/2):1/x^(2/3)=x^(1/2)*x^(2/3)=x^(5/6)
2
m^(3/2-n^(3/2)
-------------------
m^(1/2)-n^(1/2)
Умножим числитель и знаменатель на m^(1/2)+n^(1/2)
Получим
(m^(3/2-n^(3/2))*(m^(1/2)+n^(1/2)) m^2-n^2+m^(1/2)*n^(1/2)*(m-n)
--------------------------------------------=-----------------------------------------=
(m^(1/2)-n^(1/2))*(m^(1/2)+n^(1/2)) m-n
m+n+m^(1/2)*n^(1/2)