Răspuns:
Explicație pas cu pas:
3.
a = (√2 + 5√2 - 6√2)*√5 - 16/21 : (-2/63) = 0 + 16/21*63/2 = 24
4.
a)
/2*0 - 1/ = /-1/ = 1 ≤ 3
b)
- 3 ≤ 2x - 1 ≤ 3
-2 ≤ 2x ≤ 4
-1 ≤ x ≤ 2
A = [-1; 2] interval inchis in -1 si 2
5.
E(x) = x^2 + 2x + 1 + 2x^2 + 8x + 6 + x^2 + 6x + 9 = 4x^2 + 16x + 16 =
(2x + 4)^2
E(n) = (2n + 4)^2 patrat perfect, oricare numar natural n
