Упростим 1 дробь
(9a-25a^-1) /(3a^1/2 -5a^(-1/2))=(9a-25/a) /( a^-1/2(3a-5))=
= (9a^2-25)/a) / (3a-5)/a^1/2= (3a-5)(3a+5)/a *(a^1/2)/(3a-5)=3a+5)/a^1/2.
упростим 2 дробь
(a+7+10/a) / (a^-1/2(a+2))=( (a^2+7a+10)/a) *a^1/2/(a+2) =
=( (a+2)(a+5)/a * a^1/2(a+2) =(a+5)/a^1/2.
[ (3a+5)/a^1/2 -(a+5)/a^1/2 ]^4= (3a+5-a-5)/a^1/2]^4=(2a/a^1/2)^4=(2a^1/2)^4=16a^2