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