直接寫出得數(shù).
2
9
×4=
4
5
×
3
8
=
9
10
=
4
25
×50=
6
5
×
2
3
=
5
8
×
4
25
=
5
12
×
3
10
=
5
12
×
3
20
=
分析:分?jǐn)?shù)乘法的計(jì)算方法:分母和分母相乘的積做分母,分子和分子相乘的積做分子,能約分的要先約分再計(jì)算.
解答:
解:
2
9
×4=
8
9
,
4
5
×
3
8
=
3
10
,
9
10
=0,
4
25
×50=8,
6
5
×
2
3
=
4
5
5
8
×
4
25
=
1
10
,
5
12
×
3
10
=
1
8
,
5
12
×
3
20
=
1
16
點(diǎn)評(píng):本題考查了基本的分?jǐn)?shù)乘法的計(jì)算,注意能約分的要先約分再乘,結(jié)果要化成最簡(jiǎn)分?jǐn)?shù).
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