分数加减混合运算,下面各题怎样简便就怎样算.(递等式)
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/18 13:10:42
分数加减混合运算,下面各题怎样简便就怎样算.(递等式)
(1)5/6-4/9+1/6-2/9
(2)5/8+1/8-3/10-1/10
(3)9/10-(1/10+2/5)
(1)5/6-4/9+1/6-2/9
(2)5/8+1/8-3/10-1/10
(3)9/10-(1/10+2/5)
![分数加减混合运算,下面各题怎样简便就怎样算.(递等式)](/uploads/image/z/12612249-9-9.jpg?t=%E5%88%86%E6%95%B0%E5%8A%A0%E5%87%8F%E6%B7%B7%E5%90%88%E8%BF%90%E7%AE%97%2C%E4%B8%8B%E9%9D%A2%E5%90%84%E9%A2%98%E6%80%8E%E6%A0%B7%E7%AE%80%E4%BE%BF%E5%B0%B1%E6%80%8E%E6%A0%B7%E7%AE%97.%EF%BC%88%E9%80%92%E7%AD%89%E5%BC%8F%EF%BC%89)
(1)5/6-4/9+1/6-2/9
=(5/6+1/6)-(4/9+2/9)
=1-2/3
=1/3
(2)5/8+1/8-3/10-1/10
=(5/8+1/8)-(3/10+1/10)
=3/4-2/5
=15/20-8/20
=7/20
(3)9/10-(1/10+2/5)
=9/10-1/10-2/5
=4/5-2/5
=2/5
=(5/6+1/6)-(4/9+2/9)
=1-2/3
=1/3
(2)5/8+1/8-3/10-1/10
=(5/8+1/8)-(3/10+1/10)
=3/4-2/5
=15/20-8/20
=7/20
(3)9/10-(1/10+2/5)
=9/10-1/10-2/5
=4/5-2/5
=2/5