题目内容

1
3
÷
1
2
×
3
4
1
5
÷3+
1
3
×
4
5
3
5
÷(
3
10
+
5
8
)     
7
9
-
11
18
)÷
11
18
4
5
÷28×
7
5
22
7
÷16×
14
33
19
13
×
6
7
-
6
7
×
5
13
7
8
-
5
6
)÷
11
24
分析:(1)(5)(6)按照从左到右的顺序计算;
(2)(7)利用乘法分配律简算;
(3)先算小括号里面的加法,再算除法;
(4)(8)先算小括号里面的减法,再算除法.
解答:
解:(1)
1
3
÷
1
2
×
3
4
=
1
3
×2×
3
4

=
1
2
;(2)
1
5
÷3+
1
3
×
4
5

=
1
5
×
1
3
+
1
3
×
4
5

=
1
3
×(
4
5
+
1
5

=
1
3
×1
=
1
3


(3)
3
5
÷(
3
10
+
5
8
) 
=
3
5
÷
37
40

=
3
5
×
40
37

=
24
37


(4)(
7
9
-
11
18
)÷
11
18

=
1
6
×
18
11

=
3
11


(5)
4
5
÷28×
7
5

=
4
5
×
1
28
×
7
5

=
1
25


(6)
22
7
÷16×
14
33

=
22
7
×
1
16
×
14
33

=
1
12


(7)
19
13
×
6
7
-
6
7
×
5
13

=(
19
13
-
5
13
)×
6
7

=
14
13
×
6
7

=
12
13


(8)(
7
8
-
5
6
)÷
11
24

=
1
24
×
24
11

=
1
11
点评:计算搞清运算顺序,抓住数字特点,利用运算定律合理计算即可.
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