题目内容

8.88×12.5
9
32
÷
5
2
+
3
5
×
9
32
(
3
5
+2.4×
1
3
1
7
2011×
2009
2010
(1)8.88×12.5,
=(8+0.8+0.08)×12.5,
=8×12.5+0.8×12.5+0.08×12.5,
=100+10+1,
=111;

(2)
9
32
÷
5
2
+
3
5
×
9
32

=(
2
5
+
3
5
)×
9
32

=1×
9
32

=
9
32


(3)(
3
5
+2.4×
1
3
)×
1
7

=(
3
5
+
4
5
)×
1
7

=
7
5
×
1
7

=
1
5


(4)2011×
2009
2010

=(2010+1)×
2009
2010

=2010×
2009
2010
+1×
2009
2010

=2009+
2009
2010

=2009
2009
2010
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