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8
21
×
7
16
=
2
3
÷14=
26×
12
13
=
14
13
÷28=
12×
4
3
=
9
8
×
8
3
=
5
8
×
1
5
=
2
3
×24=
9
5
÷
3
10
=
25÷4+25×
3
4
=
分析:分数乘法:分子相乘的积做分子,分母相乘的积做分母,能约分的先约分;
分数除法:除以一个不为零的数等于乘上这个数的倒数;
25÷4+25×
3
4
先把除法变成乘法,再运用乘法分配律简算.
解答:解:
8
21
×
7
16
=
1
6
2
3
÷14=
1
21
26×
12
13
=24
14
13
÷28=
1
26
12×
4
3
=16
9
8
×
8
3
=3
5
8
×
1
5
=
1
8
2
3
×24=16
9
5
÷
3
10
=6
25÷4+25×
3
4
=25.
点评:本题考查了简单的运算,要注意根据运算法则和运算定律快速准确的得出答案.
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