3/4+5/6怎么算
来源:蜘蛛抓取(WebSpider)
时间:2020-03-04 00:46
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47.
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去括号移项得1?-2?+3?-4?+5?-6?+...+99?-100?=(1?-2?)+(3?-4?)+(5?-6?)+...+(99?-100?)=(-3)+(-7)+(-11)+...+(-199)它们是一组等差数列,共囿50个数...
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去括号,移项得1?-2?+3?-4?+5?-6?+...+99?-100?=(1?-2?)+(3?-4?)+(5?-6?)+...+(99?-100?)=(-3)+(-7)+(-11)+...+(-199)它们是一组等差数列共有50个数,公差是-4