Question

直接寫(xiě)得數(shù) 12÷ 3 5 =	5 8 ×16=	1÷ 3 8 =
5 7 × 2 3 ÷ 5 7 =	5 16 × 8 15 =	1 7 + 2 3 =
0.3× 5 6 =	0× 7 12 + 1 8 =	3 5 ÷ 9 10 =
17 20 ÷ 1 40 =	8 9 ： 4 15 =	1 2 × 1 3 ÷ 1 2 × 1 3 =

Answer 1

分析：分?jǐn)?shù)乘法的計(jì)算方法：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)除法的方法：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；據(jù)此計(jì)算得解．

解答：解：

12÷ 3 5 =20	5 8 ×16=10	1÷ 3 8 = 8 3
5 7 × 2 3 ÷ 5 7 = 2 3	5 16 × 8 15 = 1 6	1 7 + 2 3 = 17 21
0.3× 5 6 =0.25	0× 7 12 + 1 8 = 1 8	3 5 ÷ 9 10 = 2 3
17 20 ÷ 1 40 =34	8 9 ： 4 15 = 10 3	1 2 × 1 3 ÷ 1 2 × 1 3 = 1 9

點(diǎn)評(píng)：本題主要考查了分?jǐn)?shù)乘法的計(jì)算方法，注意結(jié)果要化成最簡(jiǎn)分?jǐn)?shù)．