Nguyễn Khánh Kiều Duyên
Bài 1 (2 điểm): Thực hiện tính: 1) 81+57 +19+143 3) 78.32+78.23 +78.17 +22.72 5) 2.5-3.2+45:4³ 7) 3.5² +15.2²-26:2 9) (2³.9¹ +9³.45): (92.10-9²) 11) 1407-{[(285-185): 2².3] +12} -{5.[409-(2².3-21)-1724]} 13) 500- 15) (2¹7 +172). (9¹5-3¹5).(2¹-4²) 2) 35² +35.85 +65.75 +65.45 4) 44.17 +29.56 +13.44 +56 6) 95 9³ +2³.3+2020⁰ 8) 5³.2-100: 4+2³.5 10) (71997-71996): (710047) 12) 375: {32-[4+ (5.3²-42)]}-14 14) 142-[50-(2³.10-2.5)] 16) 205- [1200-(4²-2.3)]: 40