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下面各题.怎样简便就怎样算.69÷(34+25)÷5% 57×724+57÷24171118×(911×19-911)514÷[(14+57)-67].

编辑:chaxungu时间:2026-04-27 13:18:20分类:小学数学题库

下面各题,怎样简便就怎样算.
69÷(
3
4
+
2
5
)÷5%
5
7
×
7
24
+
5
7
÷
24
17

11
18
×(
9
11
×19-
9
11
)
5
14
÷[(
1
4
+
5
7
)-
6
7
].(1)69÷(
3
4
+
2
5
)÷5%,
=69÷
23
20
÷
1
20
,
=69×
20
23
×20,
=1200;

(2)
5
7
×
7
24
+
5
7
÷
24
17
,
=
5
7
×
7
24
+
5
7
×
17
24
,
=
5
7
×(
7
24
+
17
24
),
=
5
7
×1,
=
5
7
;

(3)
11
18
×(
9
11
×19-
9
11
),
=
11
18
×[
9
11
×(19-1)],
=
11
18
×[
9
11
×18],
=
11
18
×
9
11
×18,
=9;

(4)
5
14
÷[(
1
4
+
5
7
)-
6
7
],
=
5
14
÷[
1
4
+
5
7
-
6
7
],
=
5
14
÷[
1
4
-
1
7
],
=
5
14
÷
3
28
,
=
5
14
×
28
3
,
=
10
3
.