题目内容
2009÷2009
9.81×0.1+0.5×98.1+0.049×981
0.38×7-
+4×
（
+
）×23×19．
| 2009 |
| 2010 |
9.81×0.1+0.5×98.1+0.049×981
0.38×7-
| 19 |
| 50 |
| 19 |
| 50 |
（
| 1 |
| 19 |
| 1 |
| 23 |
（1）2009÷2009
=2009÷
=2009×
=
；
（2）9.81×0.1+0.5×98.1+0.049×981
=9.81×0.1+5×9.81+4.9×9.81
=9.81×（0.1+5+4.9）
=9.81×10
=98.1；
（3）0.38×7-
+4×
=
×7-
+4×
=
×（7-1+4）
=
×10
=
；
（4）（
+
）×23×19
=（
×23+
×23）×19
=（
+1）×19
=
×19+19
=23+19
=42．
| 2009 |
| 2010 |
=2009÷
| 2009×(2010+1) |
| 2010 |
=2009×
| 2010 |
| 2009×(2010+1) |
=
| 2010 |
| 2011 |
（2）9.81×0.1+0.5×98.1+0.049×981
=9.81×0.1+5×9.81+4.9×9.81
=9.81×（0.1+5+4.9）
=9.81×10
=98.1；
（3）0.38×7-
| 19 |
| 50 |
| 19 |
| 50 |
=
| 19 |
| 50 |
| 19 |
| 50 |
| 19 |
| 50 |
=
| 19 |
| 50 |
=
| 19 |
| 50 |
=
| 19 |
| 5 |
（4）（
| 1 |
| 19 |
| 1 |
| 23 |
=（
| 1 |
| 19 |
| 1 |
| 23 |
=（
| 23 |
| 19 |
=
| 23 |
| 19 |
=23+19
=42．
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