题目内容
| 8.88×12.5 |
| ||||||||
(
| 2011×
|
(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)
÷
+
×
,
=(
+
)×
,
=1×
,
=
;
(3)(
+2.4×
)×
,
=(
+
)×
,
=
×
,
=
;
(4)2011×
,
=(2010+1)×
,
=2010×
+1×
,
=2009+
,
=2009
.
=(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 |
| 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 |
| 2009 |
| 2010 |
=2009+
| 2009 |
| 2010 |
=2009
| 2009 |
| 2010 |
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