Question

直接寫出得數(shù)． 2 8 + 5 8 =	3 4 - 2 4 =	1 7 + 3 7 =	3 7 - 2 7 =
2 6 + 4 6 =	4 5 - 3 5 =	2 2 - 5 5 =	1- 1 3 =

Answer 1

分析：①②③④⑤⑥屬于同分母分?jǐn)?shù)的加減法計(jì)算，只把分子相加減，分母不變；⑦兩個(gè)分?jǐn)?shù)等于，因此結(jié)果為0；⑧把1寫成

3

3

，再計(jì)算．

解答：解：

2 8 + 5 8 = 7 8	3 4 - 2 4 = 1 4	1 7 + 3 7 = 4 7	3 7 - 2 7 = 1 7
2 6 + 4 6 =1	4 5 - 3 5 = 1 5	2 2 - 5 5 =0	1- 1 3 = 2 3 ．

點(diǎn)評：此題主要考查同分母分?jǐn)?shù)的加減法計(jì)算，掌握方法，很好解決．