10 + 12 + 14 + 16 + 18 + 20 B/ (125 – 17 X 4) X (12 – 11 – 1)

Bài 2: Tính nhanh:10 + 12 + 14 + 16 + 18 + 20 b/ (125 – 17 x 4) x (12 – 11 – 1)