Question

直接寫(xiě)出得數(shù)．

4 5 + 2 5 =	5 7 - 3 7 =	1 3 + 1 7 =
1 3 - 1 5 =	1 2 - 1 6 =	5-1 3 4 =
0.375+ 1 8 =	1.2+ 1 2 =	7 3 4 -1.25=

Answer 1

考點(diǎn)：分?jǐn)?shù)的加法和減法

專題：運(yùn)算順序及法則

分析：同分母分?jǐn)?shù)相加減，分母不變，只把分子相加減；異分母分?jǐn)?shù)相加減，要先通分再根據(jù)同分母分?jǐn)?shù)加減法的計(jì)算方法進(jìn)行計(jì)算．在分?jǐn)?shù)同小數(shù)進(jìn)行加減時(shí)，可把分?jǐn)?shù)化成小數(shù)再進(jìn)行加減，也可把小數(shù)化成分?jǐn)?shù)再進(jìn)行加減．

解答：

解： 4 5 + 2 5 = 6 5	5 7 - 3 7 = 2 7	1 3 + 1 7 = 10 21
1 3 - 1 5 = 2 15	1 2 - 1 6 = 1 3	5-1 3 4 =3 1 4
0.375+ 1 8 = 1 2	1.2+ 1 2 =1.7	7 3 4 -1.25=6.5

點(diǎn)評(píng)：本題主要考查了學(xué)生根據(jù)分?jǐn)?shù)加減法的掌握情況．