综合套题十
6000 ÷ 50 =	69 ×50 =	17.7 + 67.8 =
6.4 - 1.7 =	447 +87 =	1.7 ÷ 1000 =
20 - 7.27 =	78.6 × 100 =	460 - 70 =
2.74 × 1000 =	5.1 + 5.52 =	20 ÷ 10000 =
2、简便计算
8000 ÷ 8 ÷ 125	91 × 25 × 4	689 + 915 + 239 + 111 + 261
1001 × 616 - 616	19 × 1009	576 - 194 - 106
3、四则运算与灵活运用
1320 ÷ 58 × 29	375 ÷ 25	( 480 + 375 ) ÷ 5
6.1 - 2.1 + 7.6	29 × 700 ÷ 14	[(82+79)×2-130]×3
248 - 384 ÷ 6 + 426	328 - ( 228 - 487 )	240 ÷ 8 ÷ 6 + 277