直接寫得數(shù).
1
3
-
1
6
=
7
12
+
5
6
=
1+
4
9
=
1
2
-
1
8
=
1-
3
5
=
1
4
+
1
5
=
1-
4
15
=
6
7
+
4
5
+
1
7
=
6
1
2
-
1
4
=
7-
4
9
-
5
9
=
8-4
4
5
=
1
6
+
4
7
+
5
6
+
3
7
=
分析:本題根據(jù)分?jǐn)?shù)加法與減法的運(yùn)算法則計(jì)算即可;
6
7
+
4
5
+
1
7
可根據(jù)加法交換律計(jì)算;
7-
4
9
-
5
9
可根據(jù)一個(gè)數(shù)減兩個(gè)數(shù),等于減去這兩個(gè)數(shù)的和的減法性質(zhì)進(jìn)行計(jì)算;
1
6
+
4
7
+
5
6
+
3
7
可根據(jù)加法交換律及結(jié)合律進(jìn)行計(jì)算.
解答:解:
1
3
-
1
6
=
1
6
,
7
12
+
5
6
=
17
12
,
1+
4
9
=1
4
9
1
2
-
1
8
=
3
8
1-
3
5
=
2
5
,
1
4
+
1
5
=
9
20
,
1-
4
15
=
11
15
,
6
7
+
4
5
+
1
7
=1
4
5
6
1
2
-
1
4
=6
1
4
7-
4
9
-
5
9
=6,
8-4
4
5
=3
1
5
1
6
+
4
7
+
5
6
+
3
7
=2.
點(diǎn)評:完成本題要細(xì)心分析式中數(shù)據(jù),然后快速準(zhǔn)確得出答案.
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