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计算下面各题. 1415×(1-27) 59×[34-(716-14)] 457-(57+2.5) 18×58+42÷8 512×19+79×512+512÷9 9.84-137-247.

编辑:chaxungu时间:2026-04-27 13:18:24分类:小学数学题库

计算下面各题(能简算的要简算).
14
15
×(1-
2
7
)
5
9
×[
3
4
-(
7
16
-
1
4
)]
4
5
7
-(
5
7
+2.5)
1
8
×58+42÷8
5
12
×
1
9
+
7
9
×
5
12
+
5
12
÷9
9.84-1
3
7
-2
4
7
.
(1)
14
15
×(1-
2
7
),
=
14
15
×1-
14
15
×
2
7
,
=
14
15
-
4
15
,
=
2
3
;

(2)
5
9
×[
3
4
-(
7
16
-
1
4
)],
=
5
9
×[
3
4
-
7
16
+
1
4
],
=
5
9
×[1-
7
16
],
=
5
9
×
9
16
,
=
5
16
;

(3)4
5
7
-(
5
7
+2.5),
=4
5
7
-
5
7
-2.5,
=4-2.5,
=1.5;

(4)
1
8
×58+42÷8,
=
1
8
×58+42×
1
8
,
=
1
8
×(58+42),
=
1
8
×100,
=12.5;

(5)
5
12
×
1
9
+
7
9
×
5
12
+
5
12
÷9,
=
5
12
×
1
9
+
7
9
×
5
12
+
5
12
×
1
9
,
=
5
12
×(
1
9
+
7
9
+
1
9
),
=
5
12
×1,
=
5
12
;

(6)9.84-1
3
7
-2
4
7
,
=9.84-(1
3
7
+2
4
7
),
=9.84-4,
=5.84.