1.3/7×49/9-4/32.8/9×15/36+1/273.12×5/6–2/9×34.8×5/4+1/45.6÷3/8–3/8÷66.4/7×5/9+3/7×5/97.5/2-(3/2+4/5)8.7/8+(1/8+1/9)9.9×5/6+5/610.3/4×8/9-1/311.7×5/49+3/1412.6×(1/2+2/3)13.8×4/5+8×11/514.31×5/6–5/615.9/7-(2/7–10/21)16.5/9×18–14×2/717.4/5×25/16+2/3×3/418.14×8/7–5/6×12/1519.17/32–3/4×9/2420.3×2/9+1/321.5/7×3/25+3/722.3/14××2/3+1/623.1/5×2/3+5/624.9/22+1/11÷1/225.5/3×11/5+4/326.45×2/3+1/3×1527.7/19+12/19×5/628.1/4+3/4÷2/329.8/7×21/16+1/230.101×1/5–1/5×211.口算下面各题(1)58+42=(2)87-45=(3)125×8=(4)50×12=(5)804÷4=(6)134+66=(7)1000-98=(8)720÷5=(9)0÷47=2.先填写下面各题的运算顺序,再计算出得数.(1)168+36-36+32=(2)153-5×14+83=(3)50×5÷50×5=3.判断:对的打“√”,错的打“×”(1)13×15与15×13表示的意义相同.()(2)3000÷425÷8的计算结果一定小于3000÷(425×8)的计算结果.()(3)两个因数的积是800,如果一个因数不变,另一个因数缩小20倍,那么积是40.()(4)算式:“750÷25+35×2”所表示的意义是750除以25的商;加上35的2倍,和是多少?()(5)24×25=6×4×25=6+100=106()4.用简便方法计算:(1)3786-499(2)32×25×125(3)1653-338-662(4)7987+350+2013+450(5)38×38+62×38(6)452+99×452(7)201×79(8)50×125×4×85.计算下面各题:(1)340×(120-40÷8)(2)45×(720-1957÷19)(3)86+[4500+(2088÷36)÷2](4)396×[74-(4875÷15-13×21)](5)[1054-(174-168)]÷8(6)6048÷[(107-99)×9]
1、9/7 - ( 2/7 – 10/21 )
2、5/2 -( 3/2 + 4/5 )
3、7/8 + ( 1/8 + 1/9 )
4、6/2 -( 3/2 + 4/5 )
5、8 + ( 1/8 + 1/9 )
6、4/7 - ( 2/7 – 10/21 )
7、2/9+1/2-4/5+3/8
8、1/2+1/4+4/5-1/8
9、3-5/4 + 1/4
10、3/14 - 2/3 + 1/6
11、 1/5 +2/3 + 5/6
12、3 - 2/9 + 1/3
13、 5/7+ 3/25 + 3/7
14、17/32 – 3/4 + 9/24
15、1/3 +6/5– 5/6
16、8-5/4 + 1/4
17、1/9 +1/8 – 1/4 - 2/7
18、2+5/6 – 2/9 -3
19、1/4 +8/7 – 5/6 -12/15
20、5/9 + 1/8 – 1/4 - 2/7
5/2 -( 3/2 + 4/5 )
2. 7/8 + ( 1/8 + 1/9 )
3. 5/6 + ( 1/2 + 2/3 )
4. 9/7 - ( 2/7 - 10/21 )
5. 3/7 + 49/9 + 4/7
6. 8/9 + 15/36 + 3/27
7. 5/2 - ( 3/2 + 4/5 )
8. 7/8 + ( 1/8 + 1/9 )
9. 9/7 - ( 2/7 - 10/21 )
10. 1/5 + ( 3/7 + 8/10 )
1. 3/7 -49/9 - 4/3
2. 8/9 + 15/36 + 1/27
3. 12+5/6 – 2/9 ×3
4. 8+ 5/4 + 1/4
5. 6- 3/8 – 3/8 ÷6
6. 4/7 - 5/9 + 3/7 - 5/9
7. 5/2 -( 3/2 + 4/5 )
8. 7/8 + ( 1/8 + 1/9 )
9. 9 - 5/6 + 5/6
10. 3/4 - 8/9 - 1/3
11. 7 - 5/49 + 3/14
12. 6 +( 1/2 + 2/3 )
13. 8 +4/5 + 8 -11/5
14. 31 -5/6 – 5/6
15. 9/7 - ( 2/7 – 10/21 )
16. 5/9 + 18 – 14 +2/7
17. 4/5 + 25/16 + 2/3 +3/4
18. 14 - 8/7 – 5/6 + 12/15
19. 17/32 – 3/4 - 9/24
20. 3 +2/9 + 1/3
21. 5/7 × 3/25 + 3/7
22. 3/14 +2/3 + 1/6
23. 1/5 -/3 + 5/6
24. 9/22 + 1/11 -1/2
25. 5/3 - 11/5 + 4/3
26. 45 - 2/3 + 1/3 -15
27. 7/19 + 12/19 +5/6
28. 1/4 + 3/4 +2/3
29. 8/7 +21/16 + 1/2
30. 101 + 1/5 – 1/5 - 21
3/8+7/10+5/8=17/10 7/8-(1/8+3/4)=0 4/7+1/6-4/7=1/6
2-7/9-2/9=1 3/5+7/8+2/5=15/8 7/9-(1/9+1/3)=1/3
1/4+(2/5+3/4)=7/5 5/6-3/10+1/6-7/10=0 3/4+1/6-2/3=1/4
7/8-1/4+4/9=77/72 1-1/3+2/7=20/21 1/2+4/5-3/10=1
5/6-(2/3-1/9)=5/18 9/10-(3/4+1/8)=1/40 1/2+2/3-3/4=5/12
7/8-1/6+1/4=23/24 1-(3/4-2/9)=17/36 9/10-1/5-1/2=1/5
1/4+3/7+1/2=33/28 7/8-(2/3+1/6)=1/24 1-(1/3+3/5)=1/15
1/2+1/4+1/3=13/12 7/8+1/4+1/2=5/8 5/7-(4/7+1/9)=2/63
1-1/4-1/2=1/4 3/4-1/6-1/3=1/4 3/10+1/4+2/5=19/20
2/3+1/6+1/12=11/12 1-1/4-2/5=7/20 1/2+1/9+1/12=25/36
QAQ这够了吗