分数加减法50道带答案,50道练习题答案怎么对?
分数加减法是数学学习中的重要基础,掌握其运算规则对后续学习至关重要,以下提供50道分数加减法题目及详细答案,涵盖同分母、异分母、带分数等多种类型,帮助学习者全面练习。 与答案
同分母分数加减法(1-10题)
- 3/7 + 2/7 = 5/7
- 5/9 - 1/9 = 4/9
- 8/11 + 3/11 = 11/11 = 1
- 7/12 - 5/12 = 2/12 = 1/6
- 4/15 + 10/15 = 14/15
- 9/13 - 4/13 = 5/13
- 6/17 + 11/17 = 17/17 = 1
- 2/19 + 7/19 = 9/19
- 15/20 - 8/20 = 7/20
- 1/8 + 3/8 = 4/8 = 1/2
异分母分数加减法(11-30题)
- 1/2 + 1/3 = 3/6 + 2/6 = 5/6
- 2/5 + 1/4 = 8/20 + 5/20 = 13/20
- 3/7 - 1/2 = 6/14 - 7/14 = -1/14
- 4/9 + 2/3 = 4/9 + 6/9 = 10/9 = 1 1/9
- 5/6 - 1/4 = 10/12 - 3/12 = 7/12
- 1/3 + 2/7 = 7/21 + 6/21 = 13/21
- 3/8 - 1/6 = 9/24 - 4/24 = 5/24
- 2/5 + 3/10 = 4/10 + 3/10 = 7/10
- 7/12 - 1/3 = 7/12 - 4/12 = 3/12 = 1/4
- 1/4 + 3/5 = 5/20 + 12/20 = 17/20
- 5/9 - 1/6 = 10/18 - 3/18 = 7/18
- 3/10 + 4/15 = 9/30 + 8/30 = 17/30
- 2/7 + 5/14 = 4/14 + 5/14 = 9/14
- 7/8 - 2/5 = 35/40 - 16/40 = 19/40
- 1/6 + 3/8 = 4/24 + 9/24 = 13/24
- 4/11 - 1/2 = 8/22 - 11/22 = -3/22
- 5/12 + 7/18 = 15/36 + 14/36 = 29/36
- 3/16 + 5/8 = 3/16 + 10/16 = 13/16
- 2/3 - 3/7 = 14/21 - 9/21 = 5/21
- 1/5 + 2/9 = 9/45 + 10/45 = 19/45
带分数加减法(31-50题)
- 2 1/4 + 1 3/4 = 3 + (1/4 + 3/4) = 3 + 1 = 4
- 5 2/3 - 2 1/3 = 3 + (2/3 - 1/3) = 3 1/3
- 1 1/2 + 2 1/3 = 3 + (3/6 + 2/6) = 3 5/6
- 3 3/8 - 1 5/8 = 2 + (11/8 - 5/8) = 2 6/8 = 2 3/4
- 4 1/5 + 3 2/5 = 7 + (1/5 + 2/5) = 7 3/5
- 2 7/9 - 1 4/9 = 1 + (7/9 - 4/9) = 1 3/9 = 1 1/3
- 1 2/3 + 3 1/4 = 4 + (8/12 + 3/12) = 4 11/12
- 5 1/6 - 2 5/6 = 4 + (7/6 - 5/6) = 4 2/6 = 4 1/3
- 3 3/10 + 2 2/5 = 5 + (3/10 + 4/10) = 5 7/10
- 4 1/2 - 1 3/4 = 3 + (2/4 - 3/4) = 2 + (6/4 - 3/4) = 2 3/4
- 2 1/7 + 4 1/2 = 6 + (2/14 + 7/14) = 6 9/14
- 3 5/8 - 1 7/8 = 2 + (13/8 - 7/8) = 2 6/8 = 2 3/4
- 1 3/4 + 2 2/3 = 3 + (9/12 + 8/12) = 3 17/12 = 4 5/12
- 5 1/3 - 2 5/6 = 4 + (2/6 - 5/6) = 3 + (8/6 - 5/6) = 3 3/6 = 3 1/2
- 2 1/5 + 3 3/10 = 5 + (2/10 + 3/10) = 5 5/10 = 5 1/2
- 4 2/9 - 1 5/9 = 3 + (2/9 - 5/9) = 2 + (11/9 - 5/9) = 2 6/9 = 2 2/3
- 1 1/6 + 2 1/4 = 3 + (2/12 + 3/12) = 3 5/12
- 3 3/4 - 1 1/2 = 2 + (3/4 - 2/4) = 2 1/4
- 2 2/3 + 4 1/6 = 6 + (4/6 + 1/6) = 6 5/6
- 5 1/2 - 3 3/8 = 2 + (4/8 - 3/8) = 2 1/8
相关问答FAQs
问题1:异分母分数加减法时,如何快速找到最小公分母?
解答:快速找到最小公分母的方法包括:
- 列举倍数法:列出各分母的倍数,最小的共同倍数即为最小公分母,例如分母4和6,倍数分别为4、8、12、16…和6、12、18…,最小公分母是12。
- 分解质因数法:将各分母分解质因数,取每个质因数的最高次方相乘,例如4=2²,6=2×3,最小公分母=2²×3=12。
- 最大公约数法:最小公分母=两数相乘÷最大公约数,例如4和6的最大公约数是2,最小公分母=(4×6)÷2=12。
问题2:带分数加减法中,如果被减数的分数部分小于减数的分数部分,该如何处理?
解答:当被减数的分数部分小于减数的分数部分时,需要从整数部分借“1”(即转换为与分母相同的假分数),再进行减法运算,例如计算5 1/6 - 2 5/6:
- 从整数部分5借1,得到4 + (1/6 + 6/6) = 4 7/6;
- 计算分数部分:7/6 - 5/6 = 2/6 = 1/3;
- 最终结果为4 + 1/3 = 4 1/3。
注意:借1后,原整数部分减1,分数部分需加上与分母相同的假分数(如6/6、12/12等)。
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