Question

直接寫得數(shù)

8 9 × 3 8 =	3 10 × 10 3 =	9× 7 18 =	2 3 × 9 10 =
1÷ 7 8 =	3 5 ÷ 9 10 =	5 7 ÷ 5 7 =	1 2 × 1 3 ÷ 1 2 × 1 3 =
18× 1 6 =	8 9 × 3 7 =	1 3 × 1 12 =	4 7 × 7 12 =

Answer 1

考點：分數(shù)乘法,分數(shù)除法

專題：計算題

分析：分數(shù)乘整數(shù)，用分數(shù)的分子和整數(shù)相乘的積做分子，分母不變；分數(shù)乘分數(shù)，用分子相乘的積做分子，分母相乘的積做分母，能約分的要約分；分數(shù)除以一個數(shù)（0除外），等于乘這個數(shù)的倒數(shù)．

解答： 解：

8 9 × 3 8 = 1 3	3 10 × 10 3 =1	9× 7 18 = 7 2	2 3 × 9 10 = 3 5
1÷ 7 8 = 8 7	3 5 ÷ 9 10 = 2 3	5 7 ÷ 5 7 =1	1 2 × 1 3 ÷ 1 2 × 1 3 = 1 9
18× 1 6 =3	8 9 × 3 7 = 8 21	1 3 × 1 12 = 1 36	4 7 × 7 12 = 1 3

點評：此題主要考查分數(shù)乘法和除法的運算法則的靈活應(yīng)用．