+ = | - = | 1- = | 3- = |
- = | 2-( - )= | 1- - = | + - = |
解: + = , | - = , | 1- = , | 3- =2 , |
- =- , | 2-( - )=1 , | 1- - =0, | + - = . |
分析:根据分数加减法的计算方法进行计算即可;1-
-
=1-(
+
).点评:口算时,注意运算符号和数据,然后再进一步解答即可.
编辑:chaxungu时间:2026-04-26 09:21:56分类:小学数学题库
+ = | - = | 1- = | 3- = |
- = | 2-( - )= | 1- - = | + - = |
解: + = , | - = , | 1- = , | 3- =2 , |
- =- , | 2-( - )=1 , | 1- - =0, | + - = . |
-
=1-(
+
).