题目内容
| 脱式计算(能简算的要简算). ①2.5×1.25×32 | ②
| ③
|
①2.5×1.25×32,
=2.5×1.25×4×8,
=(2.5×4)×(1.25×8),
=10×10,
=100;
②
×
+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
③
×2008,
=
×(2007+1),
=
×2007+
×1,
=2006+
,
=2006
.
=2.5×1.25×4×8,
=(2.5×4)×(1.25×8),
=10×10,
=100;
②
| 5 |
| 11 |
| 2 |
| 7 |
| 6 |
| 7 |
| 2 |
| 11 |
=
| 5 |
| 11 |
| 2 |
| 7 |
| 2 |
| 7 |
| 6 |
| 11 |
=(
| 5 |
| 11 |
| 6 |
| 11 |
| 2 |
| 7 |
=1×
| 2 |
| 7 |
=
| 2 |
| 7 |
③
| 2006 |
| 2007 |
=
| 2006 |
| 2007 |
=
| 2006 |
| 2007 |
| 2006 |
| 2007 |
=2006+
| 2006 |
| 2007 |
=2006
| 2006 |
| 2007 |
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