x y два числа
(x+y)/2 = 7
x^2- y^2=14
x+y = 14
(x-y)(x+y) = 14
x-y=1
2x = 15
x=7.5
y=6.5
x^2+y^2 = 56.25 + 42.25 = 98.5
а) (n^3-1)(n+a)
1.11-5=6
2.13-9=4
3.14-8=6
4.13-7=6
5.12-6=6
6.15-9=6