题目内容
简便算(写出简算过程)
(
-
+
)×36
8.5+8.5×99
2012×
.
(
| 4 |
| 9 |
| 1 |
| 4 |
| 1 |
| 6 |
8.5+8.5×99
2012×
| 2010 |
| 2011 |
(1)(
-
+
)×36,
=
×36-
×36+
×36,
=16-9+6,
=13;
(2)8.5+8.5×99,
=8.5×(1+99),
=8.5×100,
=850;
(3)2012×
,
=(2011+1)×
,
=2011×
+1×
,
=2010+
,
=2010
.
| 4 |
| 9 |
| 1 |
| 4 |
| 1 |
| 6 |
=
| 4 |
| 9 |
| 1 |
| 4 |
| 1 |
| 6 |
=16-9+6,
=13;
(2)8.5+8.5×99,
=8.5×(1+99),
=8.5×100,
=850;
(3)2012×
| 2010 |
| 2011 |
=(2011+1)×
| 2010 |
| 2011 |
=2011×
| 2010 |
| 2011 |
| 2010 |
| 2011 |
=2010+
| 2010 |
| 2011 |
=2010
| 2010 |
| 2011 |
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