口算.
4
7
+
2
3
=

99×
1
9
=

15
8
×
4
25
=

6-
3
5
-
2
5
=

1
4
×
2
3
×
1
5
=
4
15
×75=
23
24
×
8
69
=
1
6
×
4
7
=
5
16
×
18
15
=
1
3
×(1-
1
4
)=
分析:橫向數(shù):(1)運用分數(shù)加法計算方法解答,
(2)(3)(5)(6)(7)(8)(9)依據(jù)分數(shù)乘法計算方法解答,
(4)依據(jù)減法性質(zhì)解答,
(10)按照先算減法,再算乘法順序解答.
解答:
解:
4
7
+
2
3
=1
5
21
,

99×
1
9
=11,

15
8
×
4
25
=
3
10

6-
3
5
-
2
5
=5,

1
4
×
2
3
×
1
5
=
1
30
,
4
15
×75=20,
23
24
×
8
69
=
1
9
1
6
×
4
7
=
2
21
,
5
16
×
18
15
=
3
8
,
1
3
×(1-
1
4
)=
1
4
點評:本題主要考查學生依據(jù)分數(shù)四則運算計算順序,以及正確運用減法性質(zhì)解決問題的能力.
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