题目内容

怎样算简便就怎样算:
2008×
2006
2007

72.5+12.5+12.5÷
1
6

[(
8
9
+1
1
3
)×
3
4
-0.25]÷
1
12

(6×12.5+12.5×5)×
5
33
÷
1
8
(1)2008×
2006
2007

=(2007+1)×
2006
2007

=2007×
2006
2007
+
2006
2007

=2006+
2006
2007

=2006
2006
2007

(2)72.5+12.5+12.5÷
1
6

=72.5+12.5+75,
=160;
(3)[(
8
9
+1
1
3
)×
3
4
-0.25]÷
1
12

=[
8
9
×
3
4
+
4
3
×
3
4
-
1
4
1
12

=[
2
3
+1-
1
4
1
12

=
2
3
×12+12-
1
4
×12

=8+12-3,
=17,
(4)(6×12.5+12.5×5)×
5
33
÷
1
8

=[12.5×(6+5)]×
5
33
÷
1
8

=
25
2
×11×
5
33
×8

=
500
3
(166
2
3
)
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