Question

直接寫(xiě)出得數(shù)． 3 4 × 4 9 =	0× 2 13 =	16× 3 5 =
1÷ 3 7 =	4 5 ÷ 3 5 =	4 9 ÷ 3 5 =
3 10 ÷ 2 5 =	21÷ 7 9 =	6 11 × 5 12 =

Answer 1

分析：分?jǐn)?shù)乘法：分母和分母相乘的積做分母，分子和分子相乘的積做分子，能約分的要先約分再計(jì)算．
分?jǐn)?shù)除法：除以一個(gè)不等于0的數(shù)，等于乘這個(gè)數(shù)的倒數(shù)，進(jìn)而按照分?jǐn)?shù)乘法的計(jì)算方法計(jì)算得解．

解答：

解： 3 4 × 4 9 = 1 3	0× 2 13 =0	16× 3 5 = 48 5
1÷ 3 7 = 7 3	4 5 ÷ 3 5 = 4 3	4 9 ÷ 3 5 = 20 27
3 10 ÷ 2 5 = 3 4	21÷ 7 9 =27	6 11 × 5 12 = 5 22 ．

點(diǎn)評(píng)：本題考查了基本的分?jǐn)?shù)乘除法計(jì)算，計(jì)算時(shí)要細(xì)心，把最后的結(jié)果化成最簡(jiǎn)分?jǐn)?shù)．