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计算下面各题.能简算的必须简算. 87×386 24×(38+16+512) 13÷5+23×15 29×0.375÷67 2.4-2.4×47-37 11.58-(7511+1.58)

编辑:chaxungu时间:2026-04-27 13:19:00分类:小学数学题库

计算下面各题,能简算的必须简算.
87×
3
86
24×(
3
8
+
1
6
+
5
12
)
1
3
÷5+
2
3
×
1
5
2
9
×0.375÷
6
7
2.4-2.4×
4
7
-
3
7
11.58-(7
5
11
+1.58)
(1)87×
3
86
,
=(86+1)×
3
86
,
=86×
3
86
+1×
3
86
,
=3+
3
86
,
=3
3
86
;

(2)24×(
3
8
+
1
6
+
5
12
),
=24×
3
8
+24×
1
6
+24×
5
12
,
=9+4+10,
=23;

(3)
1
3
÷5+
2
3
×
1
5
,
=
1
3
×
1
5
+
2
3
×
1
5
,
=(
1
3
+
2
3
)×
1
5
,
=1×
1
5
,
=
1
5
.

(4)
2
9
×0.375÷
6
7
,
=
1
12
×
7
6
,
=
7
72
;

(5)2.4-2.4×
4
7
-
3
7
,
=2.4×(1-
4
7
)-
3
7
,
=2.4×
3
7
-
3
7
,
=
3
7
×(2.4-1),
=
3
7
×1.4,
=0.6;

(6)11.58-(7
5
11
+1.58),
=11.58-1.58-7
5
11
,
=10-7
5
11
,
=2
6
11
.