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口算.
11
12
-
5
6
=
56×
5
8
=
2
3
÷6
=
0+
5
7
=
4
5
×25
=
3
8
÷
1
8
=
19
15
÷
3
5
=
1
3
-
1
5
=
2
3
×6
=
6
7
×6
=
分析:异分母分数相加减,先通分,变成同分母的分数相加减,再计算;
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.
解答:解:
11
12
-
5
6
=
1
12
56×
5
8
=35
2
3
÷6
=
1
9
0+
5
7
=
5
7
4
5
×25
=20
3
8
÷
1
8
=3
19
15
÷
3
5
=
19
9
1
3
-
1
5
=
2
15
2
3
×6
=4
6
7
×6
=
36
7
点评:本题属于基本的计算,在平时都积累经验,逐步提高运算的速度和准确性.
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