题目内容
脱式计算.
(1)35÷(
÷
)
(2)
-
×
(3)
×
÷
.
(1)35÷(
6 |
5 |
3 |
7 |
(2)
3 |
8 |
3 |
10 |
5 |
6 |
(3)
5 |
9 |
6 |
25 |
3 |
10 |
分析:(1)先算括号内的,再算括号外的;
(2)先算乘法,再算减法;
(3)把除法改为乘法,约分计算.
(2)先算乘法,再算减法;
(3)把除法改为乘法,约分计算.
解答:解:(1)35÷(
÷
),
=35÷(
×
),
=35÷
,
=35×
,
=
;
(2)
-
×
,
=
-
,
=
;
(3)
×
÷
,
=
×
×
,
=
.
6 |
5 |
3 |
7 |
=35÷(
6 |
5 |
7 |
3 |
=35÷
14 |
5 |
=35×
5 |
14 |
=
25 |
2 |
(2)
3 |
8 |
3 |
10 |
5 |
6 |
=
3 |
8 |
1 |
4 |
=
1 |
8 |
(3)
5 |
9 |
6 |
25 |
3 |
10 |
=
5 |
9 |
6 |
25 |
10 |
3 |
=
4 |
9 |
点评:此题考查了分数的四则混合运算,注意运算顺序和运算法则.
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