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

20.01×83+1.7×200.1;
(1.5+2
2
3
)÷3.75-
2
3

6
5
×
3
8
+
5
8
÷
5
6
(1)807×99+807
=807×(99+1)
=807×100
=807;

(2)[1-(
1
2
-
1
4
)]×
2
5

=[1-
1
4
2
5

=
3
4
×
2
5

=
3
10


(3)20.01×83+1.7×200.1
=20.01×(83+17)
=20.01×100
=2001;

(4)(1.5+2
2
3
)÷3.75-
2
3

=4
1
6
÷3.75-
2
3

=1
1
9
-
2
3

=
4
9


(5)
6
5
×
3
8
+
5
8
÷
5
6

=
6
5
×(
3
8
+
5
8

=
6
5
×1
=1
1
5
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