题目内容

脱式计算
9
5
×
2
3
+
4
5
÷
8
7
   
2
3
×[(
3
4
-
1
6
)×
1
5
]
6
5
÷(3-
6
5
)+
11
4
[
16
5
-(
3
4
+
3
2
)]×
10
9
1
12
+
1
4
×
7
6
+1
1
8
   
19
25
÷[
9
5
-(
1
5
+
1
3
)]
1
4
÷(1-
1
2
-
1
4
)   
7
8
-
5
16
)×(
5
9
+
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)先算乘法和除法,再算加法;
(2)先算减法,再算中括号里面的乘法,最后算括号外面的乘法;
(3)先算减法,再算除法,最后算加法;
(4)先算加法,再算减法,最后算乘法;
(5)先算乘法,再按照从左向右的顺序进行计算;
(6)先算加法,再算减法,最后算除法;
(7)小括号里面按照从左向右的顺序进行计算,最后算除法;
(8)先算减法和加法,最后算乘法.
解答: 解:(1)
9
5
×
2
3
+
4
5
÷
8
7

=
6
5
+
7
10

=
19
10


(2)
2
3
×[(
3
4
-
1
6
)×
1
5
]
=
2
3
×[
7
12
×
1
5
]
=
2
3
×
7
60

=
7
90


(3)
6
5
÷(3-
6
5
)+
11
4

=
6
5
÷
9
5
+
11
4

=
2
3
+
11
4

=
41
12


(4)[
16
5
-(
3
4
+
3
2
)]×
10
9

=[
16
5
-
9
4
10
9

=
19
20
×
10
9

=
19
18


(5)
1
12
+
1
4
×
7
6
+1
1
8

=
1
12
+
7
24
+1
1
8

=
3
8
+1
1
8

=1
1
2


(6)
19
25
÷[
9
5
-(
1
5
+
1
3
)]
=
19
25
÷[
9
5
-
8
15
]
=
19
25
÷
19
15

=
3
5


(7)
1
4
÷(1-
1
2
-
1
4

=
1
4
÷(
1
2
-
1
4

=
1
4
÷
1
4

=1;

(8)(
7
8
-
5
16
)×(
5
9
+
2
3

=
9
16
×
11
9

=
11
16
点评:考查了分数四则混合运算,注意运算顺序和运算法则,然后再进一步计算.
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