Question

口算：

1 2 - 1 3 =	0.8- 1 2 =	1 3 + 2 5 =
1- 2 9 = 3 4 + 2 5 =	4 7 + 3 14 =	3 4 -0.75=
7 8 - 1 2 =	1 6 + 2 3 + 5 6 =	1- 3 7 - 4 7 =

Answer 1

考點：分?jǐn)?shù)的加法和減法

專題：運(yùn)算順序及法則

分析：根據(jù)分?jǐn)?shù)加減法的計算法則進(jìn)行計算即可，有分?jǐn)?shù)和小數(shù)參與的運(yùn)算可把分?jǐn)?shù)化成小數(shù)計算．

解答： 解：

1 2 - 1 3 = 1 6	0.8- 1 2 =0.3	1 3 + 2 5 = 11 15
1- 2 9 = 7 9 ， 3 4 + 2 5 = 23 20	4 7 + 3 14 = 11 14	3 4 -0.75=0
7 8 - 1 2 = 3 8	1 6 + 2 3 + 5 6 =1 2 3	1- 3 7 - 4 7 =0

點評：此題考查了分?jǐn)?shù)加減法的計算法則的運(yùn)用．