等差数列计算.1、995+996+997+998+999.(计算过程)2、(1999+1997+1995+...+13+11)-(12+14+16+...+1996+1998).(计算过程)3、自1开始,每隔两个数写一个数,得到数列:1,4,7,10,13,...,求出这个数列前100项之和
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![等差数列计算.1、995+996+997+998+999.(计算过程)2、(1999+1997+1995+...+13+11)-(12+14+16+...+1996+1998).(计算过程)3、自1开始,每隔两个数写一个数,得到数列:1,4,7,10,13,...,求出这个数列前100项之和](/uploads/image/z/919137-57-7.jpg?t=%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%E8%AE%A1%E7%AE%97.1%E3%80%81995%2B996%2B997%2B998%2B999.%EF%BC%88%E8%AE%A1%E7%AE%97%E8%BF%87%E7%A8%8B%EF%BC%892%E3%80%81%EF%BC%881999%2B1997%2B1995%2B...%2B13%2B11%EF%BC%89-%EF%BC%8812%2B14%2B16%2B...%2B1996%2B1998%EF%BC%89.%EF%BC%88%E8%AE%A1%E7%AE%97%E8%BF%87%E7%A8%8B%EF%BC%893%E3%80%81%E8%87%AA1%E5%BC%80%E5%A7%8B%2C%E6%AF%8F%E9%9A%94%E4%B8%A4%E4%B8%AA%E6%95%B0%E5%86%99%E4%B8%80%E4%B8%AA%E6%95%B0%2C%E5%BE%97%E5%88%B0%E6%95%B0%E5%88%97%EF%BC%9A1%2C4%2C7%2C10%2C13%2C...%2C%E6%B1%82%E5%87%BA%E8%BF%99%E4%B8%AA%E6%95%B0%E5%88%97%E5%89%8D100%E9%A1%B9%E4%B9%8B%E5%92%8C)
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