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3
10
×2
=
3
5
÷2
=
5
12
×4
=
 
5
3
÷4
=
1
20
×10
=
1
2
÷10
=
7
12
×6
=
7
2
÷6
=
分析:分数乘法的计算方法:分母和分母相乘的积做分母,分子和分子相乘的积做分子,能约分的要先约分再计算;
分数除法的方法:除以一个不等于0的数,等于乘这个数的倒数,进而按照分数乘法的计算方法计算得解.
解答:解:
3
10
×2
=
3
5
3
5
÷2
=
3
10
5
12
×4
=
5
3
 
5
3
÷4
=
5
12
1
20
×10
=
1
2
1
2
÷10
=
1
20
7
12
×6
=3
1
2
7
2
÷6
=
7
12
点评:本题主要考查了分数乘法的计算方法,注意结果要化成最简分数.
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