综合套题九
1、口算（≈为估算）
630 - 70 =	400 ÷ 25 =	40 × 350 =
202 × 47 ≈	140 ÷ 90 =	30 × 83 =
814 + 19 =	37 × 7 =	42 - 28 =
98 ÷ 50 ≈	9800 ÷ 80 =	9.6 + 5.9 =
2、竖式计算（带*要求验算）
*870 ÷ 30 =	20 ×575 =	*109 × 53 =
1517 ÷ 59 =	901 ÷ 96 =	130 ÷ 64 =
3、脱式计算
415 ÷ 5 + 950	(312 + 21) ÷ 9	168 ÷ (3 × 4)