问题 解答题
7
18
×
1
4
+
3
4
÷
18
7
  
12
7
÷(
2
3
-
1
4
87×
13
88
    
2
23
-
2
35
)×23×35.
答案

(1)

7
18
×
1
4
+
3
4
÷
18
7

=

7
18
×
1
4
+
3
4
×
7
18

=

7
18
×(
1
4
+
3
4

=

7
18
×1

=

7
18

(2)

12
7
÷(
2
3
-
1
4

=

12
7
÷
5
12

=

12
7
×
12
5

=

144
35

(3)87×

13
88

=(88-1)×

13
88

=88×

13
88
-
13
88

=13-

13
88

=12

75
88

(4)(

2
23
-
2
35
)×23×35

=

2
23
×23×35-
2
35
×23×35

=70-46

=24.

单项选择题
单项选择题