Question

算一算 240÷ 6 7 =	34 5 ÷ 9 10 =	1 3 ÷3=	3 5 ÷ 5 9 =	320÷ 8 11 =
720÷ 9 8 =	24÷ 3 4 =	1 9 + 1 8 =	1- 3 7 =	0÷ 135 136 =

Answer 1

分析：分?jǐn)?shù)加減法：要注意先通分成同分母分?jǐn)?shù)，再分母不變，分子相加減；
分?jǐn)?shù)除法：先改寫(xiě)成被除數(shù)乘除數(shù)的倒數(shù)（0除外），再按照分?jǐn)?shù)乘法的法則進(jìn)行計(jì)算．

解答：

解：240÷ 6 7 =280	34 5 ÷ 9 10 = 68 9	1 3 ÷3= 1 9	3 5 ÷ 5 9 = 27 25	320÷ 8 11 =440
720÷ 9 8 =640	24÷ 3 4 =32	1 9 + 1 8 = 17 72	1- 3 7 = 4 7	0÷ 135 136 =0．

點(diǎn)評(píng)：本題考查基本的分?jǐn)?shù)除法的計(jì)算，要注意在計(jì)算分?jǐn)?shù)除法時(shí)，有兩變：除號(hào)變乘號(hào)，除數(shù)變倒數(shù)；還要注意結(jié)果要化成最簡(jiǎn)分?jǐn)?shù)．