上午：算一算 ☆ 23 - 6 = ________ ☆ 15 - 14 = ________ ☆ 13 - 12 = ________ ☆ 26 - 8 = ________ ☆ 21 + 4 = ________ ☆ 22 - 1 = ________ ☆ 7 + 23 = ________ ☆ _______ + 5 = ...