综合套题九
1、口算（≈为估算）
8200 ÷ 60 =	2.9 + 2.2 =	17 × 6 =
63 ÷ 20 ≈	959 + 33 =	20 × 48 =
1300 ÷ 25 =	890 ÷ 20 =	810 × 60 =
497 × 69 ≈	180 - 90 =	71 - 37 =
2、竖式计算（带*要求验算）
259 ÷ 34 =	*306 × 31 =	*440 ÷ 80 =
5355 ÷ 54 =	578 ÷ 91 =	80 ×427 =
3、脱式计算
(98 + 37) × 6	808 + 276 ÷ 6	280 ÷ 5 ÷ 7