口算.
1
5
+
1
4
=
2
3
+
1
4
=
3
5
-
1
2
=
9
10
+
1
10
=
1
4
-
1
8
=
1-
3
13
=
1
2
-
1
3
=
7
8
-
1
8
=
5
6
-
2
6
=
8
9
+
7
9
=
3
11
-
3
11
=
3
8
+
1
4
=
分析:根據(jù)分?jǐn)?shù)加減法的計(jì)算方法進(jìn)行計(jì)算.
解答:解:
1
5
+
1
4
=
9
20
2
3
+
1
4
=
11
12
3
5
-
1
2
=
1
10
9
10
+
1
10
=1
1
4
-
1
8
=
1
8
1-
3
13
=
10
13
1
2
-
1
3
=
1
6
7
8
-
1
8
=
3
4
5
6
-
2
6
=
1
2
8
9
+
7
9
=
5
3
3
11
-
3
11
=0
3
8
+
1
4
=
5
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.
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