1
8
+
3
8
=
3
10
+
9
10
=
7
16
-
3
16
=
1-
5
18
=
19
12
-1=
17
20
+
7
20
=
5
6
+(
1
6
+
1
6
)=
17
30
+
23
30
-
7
30
=
1-(
2
9
+
4
9
)=
1-
5
12
+
11
12
=
分析:根據(jù)分?jǐn)?shù)的加法和分?jǐn)?shù)減法的計算方法進(jìn)行計算即可得到答案.
解答:
解:
1
8
+
3
8
=
1
2
3
10
+
9
10
=1
1
5
7
16
-
3
16
=
1
4
1-
5
18
=
13
18
19
12
-1=
7
12
17
20
+
7
20
=1
1
5
5
6
+(
1
6
+
1
6
)=1
1
3
17
30
+
23
30
-
7
30
=1
1
10
1-(
2
9
+
4
9
)=
1
3
1-
5
12
+
11
12
=1
1
2
點評:此題主要考查的是分?jǐn)?shù)加減法運算方法的靈活應(yīng)用.
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