综合套题九
1、口算(≈为估算)
40 × 340 = 1300 ÷ 25 = 601 × 37 ≈
2500 ÷ 40 = 780 + 80 = 321 - 43 =
60 × 99 = 162 ÷ 40 ≈ 84 - 47 =
4.2 - 2.7 = 42 × 6 = 660 ÷ 70 =
2、竖式计算(带*要求验算)
      *570 ÷ 20 =








      76 ÷ 18 =








      2428 ÷ 49 =








      90 ×666 =








      197 ÷ 36 =








      *404 × 71 =








3、脱式计算
      (26 + 83) × 6





      864 ÷ (18 × 3)





      407 + 64 × 4