题目内容
脱式计算.(能简算的要简算)
(1)
÷[
-(
-
)]
(2)
×(
+
÷
)
(3)200.5+9.9×2005
(4)
×2011.
(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 |
(1)
÷[
-(
-
)],
=
÷[
+
-
],
=
÷[1-
],
=
÷
,
=
;
(2)
×(
+
÷
),
=
×(
+
),
=
×
,
=
;
(3)200.5+9.9×2005,
=2005×0.1+9.9×2005,
=2005×(0.1+9.9),
=2005×10,
=20050;
(4)
×2011,
=
×(2010+1),
=
×2010+
×1,
=2009+
,
=2009
.
| 9 |
| 32 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
=
| 9 |
| 32 |
| 3 |
| 4 |
| 1 |
| 4 |
| 7 |
| 16 |
=
| 9 |
| 32 |
| 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 |
=
| 2009 |
| 2010 |
=
| 2009 |
| 2010 |
| 2009 |
| 2010 |
=2009+
| 2009 |
| 2010 |
=2009
| 2009 |
| 2010 |
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