直接寫出得數(shù).
1
3
+
2
5
=
2
3
-
2
5
=
3
4
+
3
8
=
1
2
+
1
6
=
3
5
×
7
9
=
12
7
×
14
15
=
4
7
÷
8
14
=
5
9
÷
5
6
=
1.5×0.4= 10÷2.5= 2.4×5= 0.78÷1.3=
分析:第一行是分?jǐn)?shù)的加減法,先通分,再相加減;第二行是分?jǐn)?shù)的乘除法,除法先變成乘法再計(jì)算;第三行是小數(shù)的乘除法,計(jì)算時(shí)要注意小數(shù)點(diǎn)的位置.
解答:解:
1
3
+
2
5
=
11
15
,
2
3
-
2
5
=
4
15
3
4
+
3
8
=
9
8
,
1
2
+
1
6
=
2
3
,
3
5
×
7
9
=
7
15
,
12
7
×
14
15
=
8
5
,
4
7
÷
8
14
=1,
5
9
÷
5
6
=
2
3
,
1.5×0.4=0.6,10÷2.5=4,2.4×5=12,0.78÷1.3=0.6.
故答案為:
11
15
4
15
,
9
8
,
2
3
,
7
15
8
5
,1,
2
3
,0.6,4,12,0.6.
點(diǎn)評:本題考查了基本的計(jì)算,計(jì)算時(shí)要細(xì)心,把結(jié)果化成最簡分?jǐn)?shù).
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