题目内容
计算:(1995.5-1993.5)÷1998×1999
÷
.(得数保留三位小数)
| 1997 |
| 1998 |
| 1 |
| 1999 |
原式=
×(2000-
)×1999,
=(4000-
)×
,
=(4000-
)×(1+
),
=4000+
-
,
=4000+2+
-
,
≈4002.001.
| 2 |
| 1998 |
| 1 |
| 1998 |
=(4000-
| 2 |
| 1998 |
| 1998+1 |
| 1998 |
=(4000-
| 2 |
| 1998 |
| 1 |
| 1998 |
=4000+
| 4000-2 |
| 1998 |
| 2 |
| 1998×1998 |
=4000+2+
| 2 |
| 1998 |
| 2 |
| 1998×1998 |
≈4002.001.
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