题目内容
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1÷
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3.14×5= |
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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.
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)
+
,
=
+
,
=
;
(2)
-
,
=
-
,
=
;
(3)1÷
=
;
(4)
×36=16;
(5)3.14×5=15.7;
(6)
×
=
;
(7)
÷
,
=
×
,
=
;
(8)
÷
,
=
×
,
=
;
(9)
×
=
;
(10)
÷
,
=
×
,
=
.
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 |
(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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