题目内容
计算下列分数
(1)
+
=
(2)
-
=
(3)
×
=
(4)
÷
=
(1)
6 |
15 |
3 |
10 |
(2)
6 |
15 |
3 |
10 |
(3)
6 |
15 |
3 |
10 |
(4)
6 |
15 |
3 |
10 |
考点:分数的加法和减法,分数乘法,分数除法
专题:运算顺序及法则
分析:(1)、(2)异分母分数相加、减,先通分化成相同分母的分数,再把分子相加、减.
(2)、(3)分数法法分子乘分子,分母乘分母,乘完要约分,一般先约分再乘;一个数除以一个分数就等于这个数乘这个分数的倒数.
(2)、(3)分数法法分子乘分子,分母乘分母,乘完要约分,一般先约分再乘;一个数除以一个分数就等于这个数乘这个分数的倒数.
解答:
解:(1)
+
=
+
=
=
;
(2)
-
=
-
=
=
;
(3)
×
=
×
=
或
×
=
=
;
(4)
÷
=
×
=
.
6 |
15 |
3 |
10 |
=
12 |
30 |
9 |
30 |
=
21 |
30 |
=
7 |
10 |
(2)
6 |
15 |
3 |
10 |
=
12 |
30 |
9 |
30 |
=
3 |
30 |
=
1 |
10 |
(3)
6 |
15 |
3 |
10 |
=
3 |
5 |
1 |
5 |
=
3 |
25 |
或
6 |
15 |
3 |
10 |
=
18 |
150 |
=
3 |
25 |
(4)
6 |
15 |
3 |
10 |
=
6 |
15 |
10 |
3 |
=
4 |
3 |
点评:此题题是考查分数的加、减、乘、除,属于基础知识,要掌握,关键是记住计算法则.
练习册系列答案
相关题目