试题:
用你喜欢的方法计算
352.5×55%+60.5×5.5+42.5×
11
20
4
23
×
10
19
+
4
19
×
9
23

2003×
2001
2002
19×(
2
25
+
3
19
)×25.

答案:

我来补答
(1)352.5×55%+60.5×5.5+42.5×
11
20

=352.5×0.55+60.5×5.5+42.5×0.55,
=(352.5+42.5)×0.55+60.5×5.5,
=395×0.55+605×0.55,
=(395+605)×0.55,
=1000×0.55,
=550;

(2)
4
23
×
10
19
+
4
19
×
9
23

=
10
23
×
4
19
+
4
19
×
9
23

=(
10
23
+
9
23
)×
4
19

=
19
23
×
4
19

=
4
23


(3)2003×
2001
2002

=(2002+1)×
2001
2002

=2002×
2001
2002
+
2001
2002
×
1,
=2001+
2001
2002

=2001
2001
2002


(3)19×(
2
25
+
3
19
)×25,
=
2
25
×25×19+
3
19
×19×25,
=38+75,
=113.
 
 
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