TÍNH A = 7 26 14 13 3 9 ⋅ − 1 1 ⋅A) 13 2 B) 14 5 C) 182 15 D) 1 7 ....

4. Tính A = 7 26 14 13 3 9 1 1

a) 13 2 b) 14 5 c) 182 15 d) 1 7 .

2 2 2 1 1 1

+ − − +

5 7 11 4 5 7

= +