11. Află numărul necunoscut: a) (36 : a + 63: 9): 2 = 8 b) b + 149 + [(72 : 8 + 28:4): 4] = 396 c) 93 - (85 – 9 x 9 + 5 x 8) - C = 5 x 6 + 1 d) (242 + 360 : 10 – 214): (80 : 5 – 4 x 2) x d = 1000 e) 94 + [(402 : 2 + 5 x e) x 2 + 8] : 5 = 184 f) 500 - [(16 x 18 – 192 : f): 7 + 14 x 5 + 10): 4 x 7 + 9 = 299 g) 6 + [15 – (8 : ax 7 + 7)] x 5 = 8: (1 x 4) + 3 x 3 h) 4 + 4 x [4 + 4 x (4 + h : 4) + 4) : 4 = 52 i) 834 – [(6 x 137 – 364 : i): 7 + 139] : 3 = 751 j) 234 + [(88: 4 + j) – 78: 6] x 23 = 809​