题目内容

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
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