Question

五年级数学作业

分数脱式计算：7/13x1/2x39 8/15x3/4---1/6除1/2 10除5/9+1/6除4
简算：5/9x6+4/9除1/6 （35-5/7）x1/5 8/9除3/4x5/6

麻烦大家了，是我儿子的作业，我小学毕业，数学也不好，麻烦大家帮帮我

Answer 1

7/13x1/2x39 8/15x3/4---1/6除1/2 10除5/9+1/6除4
=21x1/2 =2/5-1/3 =18+1/24
=15.5 =1/15 =18又1/24
5/9x6+4/9除1/6 （35-5/7）x1/5 8/9除3/4x5/6
=6x（5/9+4/9） =35x1/5-5/7x1/5 =8/9x4/3x5/6
=6x1 =7-1/7 =80/81
=6 =6又6/7

Answer 2

ERERED

Answer 3

脱式计算：
7/13x1/2x39
=7/26x39
=10又1/2
其余的题是除以还是除？？？？

追问

除以

Answer 4

7/13×1/2×39=[（7×1）/（13×2）]×39=7/26×39=273/26 =21/2

Answer 5

7/13x1/2x39=7/13x39x1/2=21x1/2=21/2 8/15x3/4-1/6除1/2=2/5-1/3=1/15 10除5/9+1/6除4=18+1/24=433/24
5/9x6+4/9除1/6 =10/3+8/3=6 （35-5/7）x1/5=35x1/5-5/7x1/5=7-1/7=48/7 8/9除3/4x5/6
=8/9x4/3x5/6=80/81

Answer 6

分数脱式计算：1. 21/2 2. 1/15 3. 432/24
简算：1. 6 2. 48/7 3. 80/81