1-2+3-4+5-6+·····+99-100把18-(-13)+(-21)-(-42)写成省略括号的和是:计算:见图
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![1-2+3-4+5-6+·····+99-100把18-(-13)+(-21)-(-42)写成省略括号的和是:计算:见图](/uploads/image/z/683857-1-7.jpg?t=1-2%2B3-4%2B5-6%2B%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%2B99-100%E6%8A%8A18-%EF%BC%88-13%EF%BC%89%2B%EF%BC%88-21%EF%BC%89-%EF%BC%88-42%EF%BC%89%E5%86%99%E6%88%90%E7%9C%81%E7%95%A5%E6%8B%AC%E5%8F%B7%E7%9A%84%E5%92%8C%E6%98%AF%EF%BC%9A%E8%AE%A1%E7%AE%97%EF%BC%9A%E8%A7%81%E5%9B%BE)
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1-2+3-4+5-6+·····+99-100把18-(-13)+(-21)-(-42)写成省略括号的和是:计算:见图
1-2+3-4+5-6+·····+99-100
把18-(-13)+(-21)-(-42)写成省略括号的和是:
计算:见图
1-2+3-4+5-6+·····+99-100把18-(-13)+(-21)-(-42)写成省略括号的和是:计算:见图
(1+3+5+...+97+99)-(2+4+...+98+100)
=(1+99)*50/2-(2+100)*50/2
=-50
18-(-13)+(-21)-(-42)
=18+13-21+42
=52
1/1x2+1/2x3+```````+1/2008x2009
=1-1/2+1/2-1/3+1/3-1/4+````````+1/2008-1/2009
=1-1/2009
=2008/2009
1-2+3-4+5-6+·····+99-100
=(1-2)+(3-4) 一共有50组,每组值为-1所以
=-1x50
=-50
18-(-13)+(-21)-(-42)
=18+13-21+42
=52
1/1x2+1/2x3+```````+1/2008x2009
=1-1/2+1/2-1/3+1/3-1/4+````````+1/2008-1/2009
=1-1/2009
=2008/2009
1-2+3-4+5-6+·····+99-100
=-1*50=-50
18-(-13)+(-21)-(-42)
=18+13-21+42
=1-1/1+1/2-1/3+1/3-......+1/2008-1/2009
=1-1/2009
=2008/2009
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