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数学
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计算题:-1+2+3-4-5+6+7-8-9+10+11-12-…-2005+2006+2007-2008=
计算过程要写出来,
人气:257 ℃ 时间:2019-09-27 05:47:13
解答
-1+2+3-4-5+6+7-8-9+10+11-12...-2005+2006+2007-2008
=(-1+2+3-4)+(-5+6+7-8)+(-9+10+11-12)...(-2005+2006+2007-2008)
=0
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计算:1+2-3-4+5+6-7-8+9+10-11-12+…+2005+2006-2007-2008.
1+2-3-4+5+6-7-8+…+2001+2002-2003-2004+2005+2006-2007-2008+2009=_.
用简便方法计算:1-2-3+4+5-6-7+8+9-10-11+12+...+2005-2006-2007+2008.
1+2-3-4+5+6-7-8+9+10-11-12+……++2005+2006-2007-2008+2009+2010-2011=
计算:1-2+3-4+5-6-7+8+9-10-11+12+.2001-2002-2003+2004+2005-2006-2007+2008
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