口算.
1
3
-
1
4
=

1
5
-
1
10
=
7
9
×
6
7
=
6
7
÷6
=
12
13
×26
=
5
6
=
3
4
÷
1
8
=
28×
3
4
=
7
8
×
4
7
=
2
5
×99+
2
5
=
14÷
1
5
=
(
2
3
-
1
2
)×12
=
1
4
×4
=
15×
1
3
=
1
3
+
2
13
×
13
14
=
分析:直接利用分?jǐn)?shù)四則運(yùn)算的計(jì)算法則計(jì)算出結(jié)果即可.
解答:
解:
1
3
-
1
4
=
1
12

1
5
-
1
10
=
1
10
7
9
×
6
7
=
2
3
6
7
÷6
=
1
7
12
13
×26
=24
5
6
=
6
5
3
4
÷
1
8
=6
28×
3
4
=21
7
8
×
4
7
=
1
2
2
5
×99+
2
5
=40
14÷
1
5
=70
(
2
3
-
1
2
)×12
=2
1
4
×4
=16
15×
1
3
=5
1
3
+
2
13
×
13
14
=
10
21
點(diǎn)評(píng):此題考查分?jǐn)?shù)四則運(yùn)算的計(jì)算法則,注意計(jì)算結(jié)果的化簡(jiǎn).
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