题目内容

脱式计算.
3
4
÷
3
5
÷
5
6
                     

5
9
×
3
10
÷
1
2
                      

5
9
÷5×
4
7
23
100
×[
4
5
×(
3
8
+
1
5
)]
1
29
×[(
5
6
+
3
8
)÷
1
24
]
[
2
5
-(
3
5
-
1
4
)]×
2
3
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)(2)(3)把除法改为乘法,直接约分计算即可;
(4)先算加法,再算括号里面的乘法,最后算括号外面的乘法;
(5)先算加法,再算除法,最后算乘法;
(6)先算小括号里面的减法,再算中括号里面的减法,最后算乘法.
解答: 解:(1)
3
4
÷
3
5
÷
5
6

=
3
4
×
5
3
×
6
5

=
3
2


(2)
5
9
×
3
10
÷
1
2

=
5
9
×
3
10
×2
=
1
3


(3)
5
9
÷5×
4
7

=
5
9
×
1
5
×
4
7

=
4
63


(4)
23
100
×[
4
5
×(
3
8
+
1
5
)]
=
23
100
×[
4
5
×
23
40
]
=
23
100
×
23
50

=
529
5000


(5)
1
29
×[(
5
6
+
3
8
)÷
1
24
]
=
1
29
×[
29
24
×24]
=
1
29
×29
=1;

(6)[
2
5
-(
3
5
-
1
4
)]×
2
3

=[
2
5
-
7
20
2
3

=
1
20
×
2
3

=
1
30
点评:分数四则混合运算的关键是抓住运算顺序,正确按运算顺序计算即可.
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