题目内容

1
4
+
1
6
=
2
3
-
1
2
=
3
5
=
4
9
×36
=
3.14×5=
11
9
×
3
23
=
4
9
÷
4
11
=
3
10
÷
2
5
=
6
11
×
5
12
=
1
5
÷
3
20
=
分析:同分母相加减:分母不变,分子相加减;异分母相加减:先通分,然后按同分母相加减的计算法则进行计算.
除以一个数,等于乘这个数的倒数;两个分数相乘,分子相乘的积做分子,分母相乘的积做分母,能化简的要化简,据此解答即可.
解答:解:(1)
1
4
+
1
6

=
3
12
+
2
12

=
5
12


(2)
2
3
-
1
2

=
4
6
-
3
6

=
1
6


(3)1÷
3
5
=
5
3


(4)
4
9
×36=16


(5)3.14×5=15.7;

(6)
11
9
×
3
23
=
11
69


(7)
4
9
÷
4
11

=
4
9
×
11
4

=
11
9


(8)
3
10
÷
2
5

=
3
10
×
5
2

=
3
4


(9)
6
11
×
5
12
=
5
22


(10)
1
5
÷
3
20

=
1
5
×
20
3

=
4
3
点评:此题主要考查分数加减乘除法的计算法则的灵活应用.
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