题目内容

脱式计算.(能简算的要简算)
(1)
9
32
÷[
3
4
-(
7
16
-
1
4
)]

(2)
3
5
×(
1
7
+
8
21
÷
2
3
)

(3)200.5+9.9×2005
(4)
2009
2010
×2011
(1)
9
32
÷[
3
4
-(
7
16
-
1
4
)]

=
9
32
÷[
3
4
+
1
4
-
7
16
],
=
9
32
÷[1-
7
16
],
=
9
32
÷
9
16

=
1
2


(2)
3
5
×(
1
7
+
8
21
÷
2
3
)

=
3
5
×(
1
7
+
4
7
),
=
3
5
×
5
7

=
3
7


(3)200.5+9.9×2005,
=2005×0.1+9.9×2005,
=2005×(0.1+9.9),
=2005×10,
=20050;

(4)
2009
2010
×2011

=
2009
2010
×(2010+1),
=
2009
2010
×2010+
2009
2010
×1,
=2009+
2009
2010

=2009
2009
2010
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