Question

直接寫得數(shù)． 5 7 × 3 4 =	7 9 ÷ 9 7 =	6 5 × 4 3 =	5 7 ÷ 15 2 =
8 9 × 3 4 =	5 6 ÷ 5 3 =	19 20 × 15 38 =	9 10 ÷ 3 2 =

Answer 1

分析：分?jǐn)?shù)乘法：分子相乘的積做分子，分母相乘的積做分母，能約分的先約分；
分?jǐn)?shù)除法：除以一個(gè)不為零的數(shù)等于乘上這個(gè)數(shù)的倒數(shù)．

解答：解：

5 7 × 3 4 = 15 28	7 9 ÷ 9 7 = 49 81	6 5 × 4 3 = 8 5	5 7 ÷ 15 2 = 2 21
8 9 × 3 4 = 2 3	5 6 ÷ 5 3 = 1 2	19 20 × 15 38 = 3 8	9 10 ÷ 3 2 = 3 5 ．

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