问题 解答题
脱式计算(其中①、②、④、⑤要用简便方法).
①59×
17
58

5
7
×
5
8
+1
2
7
×
5
8

5
7
-
5
7
×
1
5
13
24
×
8
19
×
9
26
(
5
12
+
3
8
)×24
⑥16-8×
3
8
答案

(1)59×

17
58

=58×

17
58
+1×
17
58

=17+

17
58

=17

17
58

(2)

5
7
×
5
8
+1
2
7
×
5
8

=(

5
7
+1
2
7
)×
5
8

=2×

5
8

=1

1
4

(3)

5
7
-
5
7
×
1
5

=

5
7
-
1
7

=

4
7

(4)

13
24
×
8
19
×
9
26

=

13
24
×
9
26
×
8
19

=

9
48
×
8
19

=

3
38

(5)(

5
12
+
3
8
)×24,

=

5
12
×24+
3
8
×
24,

=10+9,

=19;

(6)16-8×

3
8

=16-3,

=13.

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