题目内容

怎样简便怎样计算.
3.5-
1
3
-
2
3
25×(4+
3
5
3
5
+
4
5
×
1
2
6.4×9.9+6.4×
1
10
(1)3.5-
1
3
-
2
3

=3.5-(
1
3
+
2
3
),
=3.5-1,
=2.5;

(2)25×(4+
3
5
),
=25×4+25×
3
5

=100+15,
=115;

(3)
3
5
+
4
5
×
1
2

=
3
5
+
2
5

=1;

(4)6.4×9.9+6.4×
1
10

=6.4×9.9+6.4×0.1,
=6.4×(9.9+0.1),
=6.4×10,
=64.
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