1—2+3—4+5—6+······+2003—2004+2005—2006+2007等于几?
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(2+4+6+8+······+100)—(1+3+5+7+······+99)等于几
(1+3+5+······2013)—(2+4+6······+2014)用简便方法哦,这是奥数题.
(1994+1992+······+4+2)—(1+3+5+······+1991+1993)=( )
2[4/3y—(2/3y—1/2)]=3/4y急·································!1
(1+3+5+7+·····+99+101)—(2+4+6+8+····+98+100)
计算:(—1)+(+2)—3+4—5········+(—2009)+2010—2011+2012=
(1+3+5+···+997+999)—(2+4+6+···+998+1000)
(1+3+5+···+1999)—(2+4+6+···+1988) = = =
1—2+3—4+5—6+······+2003—2004+2005—2006+2007等于几?
找规律:1,1,2,3,5,8,——,21,34,——················
1 2 3 4 ·····7 ·······10 ········?1 3 5 7 ·····?······?··········290 1 4 9 ·····?······?··········?
用简便方法计算(2+4+6+8······+2014)—(1+3+5+7······+2013)
1—【1/2】的平方—【1/3】的平方—【1/4】的平方—【1/5】的平方····················会不会有负数?有是第几个?
(|+3+5+7+···+2013)—(2+4+6+8···)=?
俗语和名句的填空1······,自知之明.2······,行必果.3工欲善其事,······.4临渊羡鱼,······.5非学无以广才,······.6······,福兮祸之所伏.7项庄舞剑,······.8······,人以群
证明1·3·5·····(2n-1)/2·4·6·····2n
1+2-3-4+5+6-7-8+9+10——11-12+······+1997+1998-1999-2000+2001
2100—299—298—············—2-1=?