题目内容

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
(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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