Question

直接寫得數(shù)．

1 2 × 6 5 =	1 2 × 4 5 =	1 6 ÷8=	3 5 × 2 3 =
2 3 ×5÷ 2 3 =	5× 3 5 ÷ 2 5 =	3 4 ÷ 1 2 ÷ 2 7 =	4÷ 2 3 ÷ 2 3 =

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：除以一個數(shù)（0除外）等于乘這個數(shù)的倒數(shù)；
乘除混合運算：按照從左到右的順序計算．

解答：解：

1 2 × 6 5 = 3 10	1 2 × 4 5 = 2 5	1 6 ÷8= 1 48	3 5 × 2 3 = 2 5
2 3 ×5÷ 2 3 =5	5× 3 5 ÷ 2 5 = 15 2	3 4 ÷ 1 2 ÷ 2 7 = 21 4	4÷ 2 3 ÷ 2 3 =9

點評：本題考查了分?jǐn)?shù)乘除法的運算，要注意根據(jù)運算法則和運算順序快速準(zhǔn)確的得出答案．