综合套题九
1、口算（≈为估算）
80 × 140 =	91 - 17 =	860 ÷ 40 =
400 ÷ 77 ≈	1.6 - 0.7 =	250 + 90 =
9000 ÷ 80 =	56 × 9 =	803 × 81 ≈
1700 ÷ 25 =	217 + 47 =	82 × 50 =
2、竖式计算（带*要求验算）
254 ÷ 79 =	240 ÷ 58 =	141 ÷ 11 =
220 ×22 =	*103 × 46 =	*710 ÷ 40 =
3、脱式计算
(230 + 92) ÷ 7	220 ÷ (11 × 5)	856 + 86 × 6