The first group A, column vertical calculation: (1) 350 ÷ 60 (2) 780 ÷ 26 (3) 66× 23 (4) 895 ÷ 35 (5) 378 ÷ 42b, mixed operation: (/kloc-) kloc-0/4÷80(2)786÷23(3) 150×26(4)335÷44(5)580÷48b， Mixed operation: (1) 275-175+25 (2) 338-(138+68) (1) column vertical calculation: (1) 980 ÷. 207÷65438+ mixed operation: (1) 774 ÷ (27+16) (2) 338-(138 column vertical calculation: (1) 786 ÷. Kloc-0/00 ÷ (50 ÷ 2) (2) 468-100+68 (3) Vertical calculation of 66 columns: (1) 235 ÷ 33 (2) 202 ÷ 53 (3) 328÷(8+33)(3)65438+ column vertical calculation: (1) 350 ÷ 60 (2) 324 ÷ 8/(3) 936 ÷ 36 (4) 560.