用你喜欢的方法计算. (1)4444/7×0.25 (2)27×3.4+15.4×34-340×81% (3)155×23/156+11/156×3 (4)1/2008+2/2008+3/2008+…+2007/2008.

问题描述:

用你喜欢的方法计算.
(1)444

4
7
×0.25
(2)27×3.4+15.4×34-340×81%
(3)155×
23
156
+
11
156
×3

(4)
1
2008
+
2
2008
+
3
2008
+…+
2007
2008

(1)444

4
7
×0.25,
=444×0.25+
4
7
×
0.25,
=111+
1
7

=111
1
7

(2)27×3.4+15.4×34-340×81%,
=3.4×(27+154-81),
=3.4×100,
=340;
(3)155×
23
156
+
11
156
×3

=156×
23
156
-1×
23
156
+
33
156

=23+
10
156

=23
5
78

(4)
1
2008
+
2
2008
+
3
2008
+…+
2007
2008

=
(1+2007)+(2+2006)+…(1003+1005)
2008
+
1004
2008

=
2008×1003
2008
+
1
2

=1003+
1
2

=1003
1
2