Question

口算 0.8×1.25=	1 3 + 1 5 =	1- 3 8 =	10 11 -1+ 1 11 =
1 10 + 2 5 =	1 5 - 4 25 =	3 8 + 7 12 =	2- 1 5 =

Answer 1

考點(diǎn)：分?jǐn)?shù)的加法和減法,小數(shù)乘法

專題：計(jì)算題

分析：同分母分?jǐn)?shù)相加減，分母不變，分子相加減；異分母分?jǐn)?shù)相加減，先通分，變成同分母的分?jǐn)?shù)再計(jì)算．

解答： 解：

0.8×1.25=1	1 3 + 1 5 = 8 15	1- 3 8 = 5 8	10 11 -1+ 1 11 =0
1 10 + 2 5 = 1 2	1 5 - 4 25 = 1 25	3 8 + 7 12 = 23 24	2- 1 5 =1 4 5

點(diǎn)評(píng)：本題主要是考查了簡(jiǎn)單的分?jǐn)?shù)加減法的計(jì)算，計(jì)算時(shí)要細(xì)心，把結(jié)果化成最簡(jiǎn)分?jǐn)?shù)．