问题是:3/10 + 4/5 - 14/15
解题思路:因为三个分母10,5,15的最小公倍数是30,所以要把三个数先统一成同分母;
3/10 + 4/5 - 14/15
=9/30 + 24/30 - 28/30
=(9+24-28)/30
=5/30
=1/6
问题是:3/10 + 4/5 - 14/15
解题思路:因为三个分母10,5,15的最小公倍数是30,所以要把三个数先统一成同分母;
3/10 + 4/5 - 14/15
=9/30 + 24/30 - 28/30
=(9+24-28)/30
=5/30
=1/6