问题 解答题
8.88×12.5
9
32
÷
5
2
+
3
5
×
9
32
(
3
5
+2.4×
1
3
1
7
2011×
2009
2010
答案

(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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