得数、算式、过程)(-1)+(+2)+(-3)+(+4)+···+(-2011)+(+2012)=用拆项法做:计算:(-2009又六分之五)+(-2010又三分之二)+4019又三分之二+(-1又二分之一)=一:(-1)+(+2)+(-3)+(+4)+···+(-2011)+(+2012)=二:
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![得数、算式、过程)(-1)+(+2)+(-3)+(+4)+···+(-2011)+(+2012)=用拆项法做:计算:(-2009又六分之五)+(-2010又三分之二)+4019又三分之二+(-1又二分之一)=一:(-1)+(+2)+(-3)+(+4)+···+(-2011)+(+2012)=二:](/uploads/image/z/3831267-3-7.jpg?t=%E5%BE%97%E6%95%B0%E3%80%81%E7%AE%97%E5%BC%8F%E3%80%81%E8%BF%87%E7%A8%8B%EF%BC%89%28-1%29%2B%28%2B2%29%2B%28-3%29%2B%28%2B4%29%2B%C2%B7%C2%B7%C2%B7%2B%28-2011%29%2B%28%2B2012%29%3D%E7%94%A8%E6%8B%86%E9%A1%B9%E6%B3%95%E5%81%9A%EF%BC%9A%E8%AE%A1%E7%AE%97%EF%BC%9A%EF%BC%88-2009%E5%8F%88%E5%85%AD%E5%88%86%E4%B9%8B%E4%BA%94%EF%BC%89%2B%EF%BC%88-2010%E5%8F%88%E4%B8%89%E5%88%86%E4%B9%8B%E4%BA%8C%EF%BC%89%2B4019%E5%8F%88%E4%B8%89%E5%88%86%E4%B9%8B%E4%BA%8C%2B%EF%BC%88-1%E5%8F%88%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%80%EF%BC%89%3D%E4%B8%80%EF%BC%9A%28-1%29%2B%28%2B2%29%2B%28-3%29%2B%28%2B4%29%2B%C2%B7%C2%B7%C2%B7%2B%28-2011%29%2B%28%2B2012%29%3D%E4%BA%8C%EF%BC%9A)
得数、算式、过程)(-1)+(+2)+(-3)+(+4)+···+(-2011)+(+2012)=用拆项法做:计算:(-2009又六分之五)+(-2010又三分之二)+4019又三分之二+(-1又二分之一)=一:(-1)+(+2)+(-3)+(+4)+···+(-2011)+(+2012)=二:
得数、算式、过程)
(-1)+(+2)+(-3)+(+4)+···+(-2011)+(+2012)=
用拆项法做:计算:(-2009又六分之五)+(-2010又三分之二)+4019又三分之二+(-1又二分之一)=
一:(-1)+(+2)+(-3)+(+4)+···+(-2011)+(+2012)=
二:用拆项法做:计算:(-2009又六分之五)+(-2010又三分之二)+4019又三分之二+(-1又二分之一)=
得数、算式、过程)(-1)+(+2)+(-3)+(+4)+···+(-2011)+(+2012)=用拆项法做:计算:(-2009又六分之五)+(-2010又三分之二)+4019又三分之二+(-1又二分之一)=一:(-1)+(+2)+(-3)+(+4)+···+(-2011)+(+2012)=二:
用前后加减法,双数位减单数位有1006组、
∵2012÷2=1006
2+(-1)+4+(-3)·····+2012+(-2011)=1006
∴(-1)+(+2)+(-3)+(+4)+···+(-2011)+(+2012)=1006
你这是一道题还是两道题,第一题,很明显能看见,每两项相加等于负一,一共2012/2=1006项 所以等于负的1006一:(-1)+(+2)+(-3)+(+4)+···+(-2011)+(+2012)=
二:用拆项法做:计算:(-2009又六分之五)+(-2010又三分之二)+4019又三分之二+(-1又二分之一)=...
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你这是一道题还是两道题,第一题,很明显能看见,每两项相加等于负一,一共2012/2=1006项 所以等于负的1006
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