五年级奥数小数的巧算练习题 1． 1.135+3.346+5.557+7.768+9.979
2. 1.996+19.97+199.8
3. 6.11+9.22+8.33+7.44+5.55+4.56+3.67+2.78+1.89
4. 1.1+3.3+5.5+7.7+9.9+11.11+13.13+15.15+17.17+19.19
5. 2.89×4.68+4.68× 6.11+4.68
6. 17.48×37-17.48×19+17.48×82
7. 1.25 ×0.32×2.5
8. 75×4.7+15.9×25
9. 28.67×67+32×286.7+573.4 ×0.05
10. 172.4×6.2+2724×0.38
11. 0.00．．．0181×0.00．．．011 963个0 1028个0
12. 12.34+23.45+34.56+45.67+56.78+67.89+78.91+89.12+91.23
13. a= 0.00．．．0105 b=0.00．．．019 计算a+b a-b a×b a÷b 1994个0 1996个0
14. 4.75-9.64+8.25-1.36
15. 3.71-2.74+4.7+5.29-0.26+6.3
16. (5.25+0.125+5.75) ×8
17. 34.5×8.23-34.5+2.77×34.5
18. 6.25×0.16+264×0.0625+5.2×6.25+0.625×20
19. 0.035×935+0.035+3×0.035+0.07×61×0.5
20. 19.98×37-199.8×1.9+1998×0.82
21. 13.5×9.9+6.5+5.75×10.1
22. 0.125×0.25×0.5×64
23. 11.8×43-860×0.09
24. 32.14+64.28×0.5378×0.25+0.5378×64.28×0.75-8×64.28×0.125×0.5378
25. 0.888×125×73+999×3
25. 1998+199.8+19.98+1.998
26. a= 0.00．．．0125 b=0.00．．．08 计算a+b a-b a×b a÷b
1996个0 2000个0
=17.48×100 =1748 8. 1
原式=(1.25×0.8)×(0.4×2.5) =1×1 =1 9. 750
原式=75×4.7+5.3×(3×25) =75×(4.7+5.3)
五年级奥数小数的巧算练习题答案 1. 27.785 2. 221.766
原式=(2-0.004)+(20-0.03)+(200-0.2) =222-(0.004+0.03+0.2) =221.766 3. 111109 提示:仿上题. 4. 49.55 5. 103.25
原式=1.1×(1+3+…+9)+1.01×(11+13+…+19) =1.1×25+1.01×75 =103.25 6. 46.8 7. 1748
原式=17.48×37-17.48×19+17.48×82
=17.48×(37-19+82)
=75×10
=750
2867
原式=28.67×67+32×28.67+28.67×(20×0.05) =28.67×(67+32+1) =28.67×100 =2867
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(完整版)五年级奥数小数的巧算练习题
