口算.
1
2
+
1
3
=
6
7
÷
2
7
=
5-
5
8
=
2
3
×
1
6
÷
1
6
=
0×1
5
12
=
8
9
=
3
4
+0.25
=
(5+
3
5
)×5
=
分析:根據(jù)分?jǐn)?shù)的加減法、分?jǐn)?shù)的乘法與分?jǐn)?shù)的除法的運(yùn)算法則進(jìn)行計(jì)算即可得到答案.
解答:解:
 
1
2
+
1
3
=
5
6
6
7
÷
2
7
=3
5-
5
8
=4
3
8
2
3
×
1
6
÷
1
6
=
2
3
0×1
5
12
=0
8
9
=1
1
8
3
4
+0.25
=1
(5+
3
5
)×5
=28
故答案為:
5
6
,3,4
3
8
2
3
,0,1
1
8
,1,28.
點(diǎn)評(píng):此題主要考查的是分?jǐn)?shù)的加減法、分?jǐn)?shù)的乘法與分?jǐn)?shù)除法的計(jì)算方法,注意能約分的要先約分.
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