8ab/(a+8b) * (a/8b - 8b/a) = 8ab/(a+8b) * (a*a-8b*8b)/8ab = (a²-64b²)/(a+8b) = ((a-8b)(a+8b))/(a+8b) = a-8b = 8√5+6-8(√5-3) = 8√5+6-8√5+24 = 30
-2x+7>0
-2x>-7
x<3.5
Вложение
(a-2)*(a^2+2a+4)-a*(a+2)*(a+2)+8=(a-2)*(a^2+2a+4)-a*(a^2-4)+8=-4a
A^7b^2 + ab^7 = ab^2(a^6 + b^5)