综合套题十
470 - 80 =	8.5 - 7.6 =	2.5 + 4.64 =
50 ÷ 1000 =	15.4 × 100 =	439 +72 =
3.7 + 85.7 =	125 ×40 =	300 ÷ 25 =
9.4 ÷ 1000 =	80 - 3.55 =	9.09 × 1000 =
2、简便计算
15 × 108	842 - (444 + 242 )	428 + 428 × 999
4 × (44 × 25 )	409 + 350 + 357 + 291 + 443	45000 ÷ (45 × 125 )
3、四则运算与灵活运用
832 ÷ 38 × 19	340 - 630 ÷ 18 ÷ 7	[(45+92)×7-454]×3
668×745-745×31-37×745	7.5 + 1.45 - 6.44	192 + 74 × 8 - 355
48 × 125	288 ÷ 36	627 × 99