问题 解答题
怎样算简便就怎样算.
8
9
×(
1
4
+
5
8
)
56×(
3
7
-
3
8
)
13
17
×26+25×
13
17
(
11
15
×
3
5
+
3
5
×
4
15
3
5
答案

(1)

8
9
×(
1
4
+
5
8

=

8
9
×
1
4
+
8
9
×
5
8

=

2
9
+
5
9

=

7
9

(2)56×(

3
7
-
3
8

=56×

3
7
-56×
3
8

=24-21

=3;

(3)

13
17
×26+25×
13
17

=

13
17
×(26+25)

=

13
17
×51

=39;

(4)(

11
15
×
3
5
+
3
5
×
4
15
)÷
3
5

=(

11
15
+
4
15
)×
3
5
×
5
3

=1×(

3
5
×
5
3

=1×1

=1.

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