初一奥数题集(带答案解析) 下载本文

. 奥 数 1、(?1)2002的值 ( B ) A. 2000 B.1 C.-1 D.-2000 2、a为有理数,则

11的值不能是 ( C )

a?2000 A.1 B.-1 C .0 D.-2000 3、2007??2006??2007??2006?2007???的值等于 ( B ) A.-2007 B.2009 C.-2009 D.2007 4、(?1)?(?1)?(?1)?(?1)?(?1)的结果是 ( A ) A.-1 B.1 C.0 D.2 5、(?1)2006?(?1)2007??12008的结果是 ( A )

A.0 B.1 C.-1 D.2

16、计算?2?(?)2?(?2)的结果是 ( D )

2 A.2 B.1 C.-1 D.0 7、计算:3.825?

11?1.825?0.25?3.825?3.825?. 421111118、计算:2002?2001?2000?1999???2?1.

222323

9、计算:?

.

7238?2.5?(?0.75)?(?1)??(?). 1151113.

11、计算:32000?5?319999?6?31998.

练习:2?22?23?24?25?26?27?28?29?210.2n?1?2n?2n(2?1)?2n.6

1131351397?(?)?(??)???(????) 244666989898111结果为:??2????2?612.5

224912、计算: 13、计算: 练习:

13、计算:

.

1111d111?(?) ?????.应用:

n(n?1)dnn?11?22?33?42006?20071111?????. 5?99?1313?17101?1051?2?3?2?4?6?7?14?212. 结果为

1?3?5?2?6?10?7?21?355.

14、求x?1?x?2的最小值及取最小值时x的取值范围.

练习:已知实数a,b,c满足?1?c?0?a?b,且b?c?a,求c?1?a?c?a?b的值. 练习:

1、计算(?1)1998?(?1)1999???(?1)2006?(?1)2007的值为 ( C )

A.1 B.-1 C.0 D.10

.