Bài 1. Tính : a) 74 – 34 + 10 = b) 60 + 10 – 50 = c) 53 + 15 – 88 = d) 90 + 9 – 98 = e) 54 – 23 – 14 + 63 = f) 12 + 17 + 14 + 8 + 3 + 6 = g) […]
