7
9
-
4
9
=
2
9
2
9
;
3
8
+
5
8
=
1
1
;
1
2
-
1
2
=
0
0
;
1
3
-
1
4
=
1
12
1
12
;
3+
5
6
=
3
5
6
3
5
6
;
5-
7
11
=
4
4
11
4
4
11
;
5
7
+
2
7
=
1
1
5
6
-
3
12
=
7
12
7
12
;
1
3
+
1
6
=
1
2
1
2
2.2+6.8=
9
9
;
0.79-0.32=
0.47
0.47
1-
5
8
=
3
8
3
8
分析:橫向數(shù):(1)(3)(4)(8)依據(jù)分數(shù)減法計算方法解答,
(2)(7)(9)依據(jù)分數(shù)加法計算方法解答,
(5)(6)(12)依據(jù)整數(shù)加或減分數(shù)計算方法解答,
(10)(11)依據(jù)小數(shù)加減法計算方法解答.
解答:
解:
7
9
-
4
9
=
1
3
3
8
+
5
8
=1;
1
2
-
1
2
=0;
1
3
-
1
4
=
1
12
;
3+
5
6
=3
5
6
;
5-
7
11
=4
4
11
;
5
7
+
2
7
=1;
5
6
-
3
12
=
7
12
1
3
+
1
6
=
1
2
;
2.2+6.8=9; 0.79-0.32=0.47; 1-
5
8
=
3
8
點評:本題主要考查學生依據(jù)分數(shù)、小數(shù)加減法計算方法解決問題的能力.
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