直接寫得數(shù)
12÷
3
5
=

0.6×
5
6
=

4
5
÷
9
5
=
7
12
×
3
14
=
1
5
÷
3
5
=
3
4
-
1
8
=
3
5
×20=
6
7
+
3
8
=
180÷
9
10
=
11
15
×
25
44
=
分析:分數(shù)加減法:要注意先通分成同分母分數(shù),再分母不變,分子相加減;
分數(shù)乘法:分子和分母先約分,再計算;
分數(shù)除法:先改寫成被除數(shù)乘除數(shù)的倒數(shù),再按照分數(shù)乘法的法則進行計算.
解答:
解:12÷
3
5
=20,

0.6×
5
6
=0.5,

4
5
÷
9
5
=
4
9
7
12
×
3
14
=
1
8
,
1
5
÷
3
5
=
1
3
3
4
-
1
8
=
5
8
3
5
×20=12,
6
7
+
3
8
=
3
8
,
180÷
9
10
=200,
11
15
×
25
44
=
5
12
點評:此題考查學生看算式快速計算的能力,要注意看清運算符號,根據(jù)數(shù)據(jù)的特點,選用自己喜歡的方法計算.
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