Question

直接寫得數(shù) 6 13 + 5 13 =	1- 3 11 =	1 6 + 5 24 =	7 9 - 3 8 =
11 15 - 1 3 =	8 9 - 5 9 =	1 9 + 1 3 =	1+ 2 7 =

Answer 1

考點(diǎn)：分?jǐn)?shù)的加法和減法

專題：運(yùn)算順序及法則

分析：同分母分?jǐn)?shù)相加減，分母不變，分子相加減．
異分母分?jǐn)?shù)相加減，先通分，變成同分母的分?jǐn)?shù)相加減，再計(jì)算．

解答： 解：

6 13 + 5 13 = 11 13	1- 3 11 = 8 11	1 6 + 5 24 = 3 8	7 9 - 3 8 = 29 72
11 15 - 1 3 = 2 5	8 9 - 5 9 = 1 3	1 9 + 1 3 = 4 9	1+ 2 7 =1 2 7

點(diǎn)評：本題考查了簡單的分?jǐn)?shù)加減法的計(jì)算，計(jì)算時(shí)要細(xì)心，注意把結(jié)果化成最簡分?jǐn)?shù)．