这些题目是针对三年级学生的脱式计算练习,旨在帮助他们掌握基本的数学运算技巧,包括加法、减法、乘法、除法以及简单的括号运算。下面是对每个题目的逐步解答:
1. 132+12×37 = 132 + 444 = 576
2. 250+23×38 = 250 + 874 = 1124
3. 440+13×36 = 440 + 468 = 908
4. 199+25×89 = 199 + 2225 = 2424
5. 819+49×90 = 819 + 4410 = 5229
6. 418+57×67 = 418 + 3819 = 4237
7. 75÷15+20×5 = 5 + 100 = 105
8. [150-75]×[25-20] = 75 × 5 = 375
9. 3390-10×95 = 3390 - 950 = 2440
10. 518+18×47 = 518 + 846 = 1364
11. 419+29×54 = 419 + 1566 = 1985
12. 128+28×19 = 128 + 532 = 660
13. 319+32×56 = 319 + 1792 = 2111
14. 189+42×37 = 189 + 1554 = 1743
15. 818+41×53 = 818 + 2173 = 2991
16. (6900-2400)÷5 = 4500 ÷ 5 = 900
17. [72÷9]÷[56÷8] = 8 ÷ 7 = 1...1(或1又1/7)
18. 54 ÷ 9 ×8 = 6 × 8 = 48
19. 32+65×37 = 32 + 2405 = 2437
20. 850+27×38 = 850 + 1026 = 1876
21. 269+85×39 = 269 + 3315 = 3584
22. 280×4÷5 = 1120 ÷ 5 = 224
23. 60×8+1570 = 480 + 1570 = 2050
24. 60×(23-17) = 60 × 6 = 360
25. 215+35×47 = 215 + 1645 = 1860
26. 652+78×36 = 652 + 2808 = 3460
27. 107+29×64 = 107 + 1856 = 1963
28. (1+7)×(16-6) = 8 × 10 = 80
29. 810×4÷4 = 810 × 1 = 810
30. 33÷11+4×9 = 3 + 36 = 39
31. 307+77×83 = 307 + 6401 = 6708
32. 635+57×86 = 635 + 4902 = 5537
33. 556+38×87 = 556 + 3306 = 3862
34. 960÷4×9 = 240 × 9 = 2160
35. 350÷5×9 = 70 × 9 = 630
36. 450÷5+1250 = 90 + 1250 = 1340
37. 92×23÷4 = 2116 ÷ 4 = 529
38. 493+18×67 = 493 + 1206 = 1699
39. 465+85×34 = 465 + 2890 = 3355
这些练习涵盖了基础的算术运算,对三年级学生来说非常重要,因为它们能够帮助孩子们巩固计算技能,为更高年级的数学学习打下坚实的基础。通过这样的练习,孩子们不仅可以提高计算速度,还能培养逻辑思维能力和问题解决能力。