综合套题九
1、口算（≈为估算）
70 × 27 =	2.7 + 0.7 =	300 ÷ 47 ≈
730 × 80 =	91 - 73 =	43 × 7 =
750 ÷ 90 =	332 - 13 =	101 × 72 ≈
1500 ÷ 90 =	410 - 40 =	1800 ÷ 25 =
2、竖式计算（带*要求验算）
*350 ÷ 90 =	760 ×12 =	4264 ÷ 68 =
116 ÷ 46 =	764 ÷ 92 =	*903 × 92 =
3、脱式计算
248 ÷ (39 - 31)	728 ÷ (7 × 8)	93 + 752 ÷ 8