Question

直接寫出得數(shù)

4.1×0.5=	7.6×2.5×4=	2.88÷0.4=	1.35÷5=	2.5-1.37=
1 4 + 1 8 =	7 16 + 3 16 =	1 2 + 1 4 + 1 8 =	1 3 + 1 4 =	1 4 + 1 5 =

Answer 1

分析：①先算41×5，然后在結(jié)果中從后向前數(shù)出兩位，點(diǎn)上小數(shù)點(diǎn)即可；②運(yùn)用乘法結(jié)合律簡算；③把被除數(shù)和除數(shù)分別擴(kuò)大10倍，再相除；④⑤注意數(shù)位對(duì)齊；⑥⑧⑨⑩通分計(jì)算；⑦把分子相加，然后約分．

解答：解：4.1×0.5=2.05；     7.6×2.5×4=76；       2.88÷0.4=7.2；      1.35÷5=0.27；     2.5-1.37=1.13；

1

4

+

1

8

=

3

8

；              

7

16

+

3

16

=

5

8

；          

1

2

+

1

4

+

1

8

=

7

8

；        

1

3

+

1

4

=

7

12

；        

1

4

+

1

5

=

9

20

．

點(diǎn)評(píng)：此題考查了小數(shù)、分?jǐn)?shù)的計(jì)算，根據(jù)題目特點(diǎn)，靈活解答．