直接寫得數(shù)
1
2
×
1
3
=
2
3
×
1
2
=
3
4
×
2
5
=
7
9
×
3
4
=
6
7
×
5
6
=
2
5
×
2
3
=
1
6
×
8
15
=
9
25
×
5
6
=
12
13
×
1
4
=
分析:此題屬于分?jǐn)?shù)的乘法計算,分子相乘的積做分子,分母相乘的積做分母,能約分的要約分,據(jù)此解答.
解答:
解:
1
2
×
1
3
=
1
6
2
3
×
1
2
=
1
3
3
4
×
2
5
=
3
10
7
9
×
3
4
=
7
12
6
7
×
5
6
=
5
7
2
5
×
2
3
=
4
15
1
6
×
8
15
=
4
45
9
25
×
5
6
=
3
10
12
13
×
1
4
=
3
13
點(diǎn)評:掌握分?jǐn)?shù)乘法的方法,是解題的關(guān)鍵.
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