(b^2-108)/(b+10) +8/(b+10) при b =3,5
Упростим
(b^2-108)/(b+10) +8/(b+10) = (b^2-108+8)/(b+10) = (b^2-100)/(b+10) = (b-10)*(b+10)/(b+10) =
=b-10 = 3,5-10 =-6,5
(x^2-y^2)/(3xy) *3y/(x-y) = (x^2-y^2)*3y/)((3xy)(x-y)) = (x-y)*(x+y)/(x(x-y)) = (x+y)/x =1+y/x
5a^2/(a^2-16): 5a/(a+4) = 5a^2/(a^2-16) *(a+4)/(5a) = 5a^2*(a+4)/((a^2-16)*5a) =
=a(a+4)/((a-4)(a+4)) = a/(a-4)