问题 解答题
能简便的要用简便计算
7
8
-
5
8
×
4
5
7
24
×
6
13
×
13
3
×8
101×
19
25
72×(
7
9
+
5
8
)
73×
7
36
-
7
36
57×
12
29
+
12
29
答案

(1)

7
8
-
5
8
×
4
5

=

7
8
-
4
8

=

3
8

(2)

7
24
×
6
13
×
13
3
×8

=

7
24
×8×(
6
13
×
13
3
),

=

7
3
×2,

=

14
3

(3)101×

19
25

=(100+1)×

19
25

=100×

19
25
+
19
25

=76+

19
25

=76

19
25

(4)72×(

7
9
+
5
8

=72×

7
9
+72×
5
8

=56+45,

=101;

(5)73×

7
36
-
7
36

=(73-1)×

7
36

=72×

7
36

=14;

(6)57×

12
29
+
12
29

=(57+1)×

12
29

=58×

12
29

=24.

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