Question

直接寫得數(shù)． 2 5 × 4 15 =	1÷ 7 10 =	1 5 - 1 6 =	9 10 ÷ 3 5 =	2 3 - 1 9 =
8÷ 2 3 =	1 2 + 1 7 =	19 53 ×0=	2× 5 6 =	4 5 ÷8=

Answer 1

考點(diǎn)：分?jǐn)?shù)的加法和減法,分?jǐn)?shù)乘法,分?jǐn)?shù)除法

專題：計(jì)算題

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；
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)；
異分母分?jǐn)?shù)相加減，先通分，化成同分母的分?jǐn)?shù)，再計(jì)算．

解答： 解：

2 5 × 4 15 = 8 75	1÷ 7 10 = 10 7	1 5 - 1 6 = 1 30	9 10 ÷ 3 5 = 3 2	2 3 - 1 9 = 5 9
8÷ 2 3 =12	1 2 + 1 7 = 9 14	19 53 ×0=0	2× 5 6 = 5 3	4 5 ÷8= 1 10

點(diǎn)評(píng)：本題考查了簡(jiǎn)單的分?jǐn)?shù)計(jì)算，計(jì)算時(shí)要細(xì)心，注意把結(jié)果化成最簡(jiǎn)分?jǐn)?shù)．