题目内容
(1999.8-1998.8)÷1999×2000
÷
的整数部分是______.
| 1998 |
| 1999 |
| 1 |
| 2000 |
因为n2-(n+1)(n-1)=1,
则:20002-1=2001×1999,(20002-1)÷1999=2001,2000×1998=19992-1,
(1999.8-1998.8)÷1999×2000
÷
=
×(2000+
)×2000
=(
×2000+
×
)×2000
=(
+
)×2000
=
+
=
+
=2001+
+1-
=2002+
-
因为
-
<1,
所以原式的整数部分是2002;
故答案为:2002.
则:20002-1=2001×1999,(20002-1)÷1999=2001,2000×1998=19992-1,
(1999.8-1998.8)÷1999×2000
| 1998 |
| 1999 |
| 1 |
| 2000 |
=
| 1 |
| 1999 |
| 1998 |
| 1999 |
=(
| 1 |
| 1999 |
| 1 |
| 1999 |
| 1998 |
| 1999 |
=(
| 2000 |
| 1999 |
| 1998 |
| 1999×1999 |
=
| 20002 |
| 1999 |
| 1998×2000 |
| 19992 |
=
| 2001×1999+1 |
| 1999 |
| 19992-1 |
| 19992 |
=2001+
| 1 |
| 1999 |
| 1 |
| 19992 |
=2002+
| 1 |
| 1999 |
| 1 |
| 19992 |
因为
| 1 |
| 1999 |
| 1 |
| 19992 |
所以原式的整数部分是2002;
故答案为:2002.
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