题目内容

脱式计算(其中①、②、④、⑤要用简便方法).
①59×
17
58

②
5
7
×
5
8
+1
2
7
×
5
8

③
5
7
-
5
7
×
1
5
④
13
24
×
8
19
×
9
26
⑤(
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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