综合套题九
1、口算（≈为估算）
628 + 84 =	50 - 17 =	670 ÷ 90 =
920 + 70 =	5.7 - 4.9 =	620 × 50 =
500 ÷ 25 =	60 ÷ 23 ≈	99 × 4 =
1200 ÷ 70 =	74 × 70 =	599 × 21 ≈
2、竖式计算（带*要求验算）
250 ×13 =	3060 ÷ 66 =	*560 ÷ 70 =
92 ÷ 27 =	494 ÷ 53 =	*307 × 21 =
3、脱式计算
456 ÷ 12 ÷ 2	52 + 225 ÷ 3	(85 - 32) × 5