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怎样简便就怎样算. (15+57)×215 211×710+211×310 13×314+314 2005×20032004 (45×35+5)÷45 73+23×65.

编辑:chaxungu时间:2026-04-27 14:17:42分类:小学数学题库

怎样简便就怎样算.
(15+
5
7
)×
2
15
2
11
×
7
10
+
2
11
×
3
10
13×
3
14
+
3
14
2005×
2003
2004
(45×
3
5
+5)÷
4
5
7
3
+
2
3
×
6
5
(1)(15+
5
7
)×
2
15

=15×
2
15
+
5
7
×
2
15

=2+
2
21

=2
2
21


(2)
2
11
×
7
10
+
2
11
×
3
10

=
2
11
×(
7
10
+
3
10
),
=
2
11
×1,
=
2
11


(3)13×
3
14
+
3
14

=(13+1)×
3
14

=14×
3
14

=3;

(4)2005×
2003
2004

=(2004+1)×
2003
2004

=2004×
2003
2004
+
2003
2004

=2003+
2003
2004

=2003
2003
2004


(5)(45×
3
5
+5)÷
4
5

=(27+5)÷
4
5

=32×
5
4

=40;

(6)
7
3
+
2
3
×
6
5

=
7
3
+
4
5

=
47
15