Question

直接寫出得數(shù)．

3 4 + 3 4 =	1 3 - 1 4 =	1 5 + 1 6 =	5- 3 11 - 8 11 =	4 5 - 1 2 =
5 6 - 4 9 =	2 3 -0.25=	7.5-（1.5+ 1 2 ）=	1-（ 3 4 - 2 5 ）=	5 4 - 7 8 =

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：根據(jù)分?jǐn)?shù)和小數(shù)加減法的計(jì)算方法進(jìn)行計(jì)算．
5-

3

11

-

8

11

根據(jù)減法的性質(zhì)進(jìn)簡(jiǎn)算．

解答： 解：

3 4 + 3 4 = 3 2	1 3 - 1 4 = 1 12	1 5 + 1 6 = 11 30	5- 3 11 - 8 11 =4	4 5 - 1 2 = 3 10
5 6 - 4 9 = 7 18	2 3 -0.25= 5 12	7.5-（1.5+ 1 2 ）=5.5	1-（ 3 4 - 2 5 ）= 13 20	5 4 - 7 8 = 3 8

點(diǎn)評(píng)：口算時(shí)，注意運(yùn)算符號(hào)和數(shù)據(jù)，然后再進(jìn)一步計(jì)算．