直接寫得數(shù)
1
4
×
3
5
=
9
16
×
16
53
=
21×
2
43
=
5
6
=
10÷
5
9
=
1
4
+0.5=
1-
3
4
=
2÷0.2=
8
25
÷
4
5
=
1
4
4
9
=
分析:
1
4
+0.5先把分數(shù)化成小數(shù)再計算;
1
4
4
9
根據(jù)比與除法的關系,變成
1
4
÷
4
9
,然后計算;其它題目根據(jù)運算法則直接求解.
解答:
解:
1
4
×
3
5
=
3
20
,
9
16
×
16
53
=
9
53
,
21×
2
43
=
42
43
5
6
=
36
5
,
10÷
5
9
=18,
1
4
+0.5=0.75,
1-
3
4
=
1
4
,
2÷0.2=10,
8
25
÷
4
5
=
2
5
1
4
4
9
=
9
16
故答案為:
3
20
,
9
53
,
42
43
36
5
,18,0.75,
1
4
,10,
2
5
9
16
點評:本題考查了基本的運算,計算時要細心,注意把結果化成最簡分數(shù).
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