您现在的位置是:首页 > 学科知识查询 > 小学数学题库

计算下面各题.807×99+807 [1-(12-14)]×25 20.11×83+1.7×201.1 65×38+58÷56.

编辑:chaxungu时间:2026-04-27 13:18:48分类:小学数学题库

计算下面各题(能简算的要简算).
807×99+807

[1-(
1
2
-
1
4
)]×
2
5
20.11×83+1.7×201.1
6
5
×
3
8
+
5
8
÷
5
6
.
(1)807×99+807,
=807×(99+1),
=807×100,
=80700;

(2)[1-(
1
2
-
1
4
)]×
2
5
,
=[1-
1
4
]×
2
5
,
=
3
4
×
2
5
,
=
3
10
;

(3)20.11×83+1.7×201.1,
=20.11×83+17×20.11,
=20.11×(83+17),
=20.11×100,
=2011;

(4)
6
5
×
3
8
+
5
8
÷
5
6
.
=
6
5
×(
3
8
+
5
8
),
=
6
5
×1,
=
6
5
.