口算
69×
5
23
=
3
5
÷
5
3
=
4
5
×
2
9
=
5
9
÷
5
18
=
0.74+
2
5
=
2
1
5
-
1
2
=
7
20
×
5
7
=
5
14
×21=
5
6
×0÷
5
6
=
12×(
1
4
+
1
3
)=
分析:根據(jù)分?jǐn)?shù)加減乘除法的計算方法進(jìn)行計算即可.
解答:
解:69×
5
23
=15
3
5
÷
5
3
=
9
25
4
5
×
2
9
=
8
45
5
9
÷
5
18
=2
0.74+
2
5
=1.14
2
1
5
-
1
2
=1.7
7
20
×
5
7
=
1
4
5
14
×21=7.5
5
6
×0÷
5
6
=0
12×(
1
4
+
1
3
)=7
點評:本題主要考查了分?jǐn)?shù)四則運算的計算方法.
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