1/4+1/28+1/70+…1/89698=?

1/4+1/28+1/70+…1/89698=? 1/4+1/28+1/70+……+1/8554 怎么计算, 计算1除4+1除28+1除70+……+1除4026040 1/4+1/28+1/70+……+1/550（利用裂项） 谁有这道题的简便算法?1/4+1/28+1/70+…+1/9700＝? 1/4 +1/28 +1/70 +1/130 +1/208 计算：900+899-898-897+896+895-894-893+……+4+3-2-1 1/4+1/28+1/70+1/130简算 1/4+1/28+1/70+.+1/9700=? 1/4+1/28+1/70+.+1/9700=? 1/4+1/28+1/70+.+1/8554=? 1/4+1/28+1/70+1/130 1/4+1/28+1/70+1/130=? 1/4+1/28+1/70+1/130.1/10300 1|4+1|28+1|70+1|130+1|208+1|304 1|4+1|28+1|70+1|130+1|208+1|304 4分之1+28分之1+70分之1+130分之1+208分之1=? 4/1+28/1+70/1+130/1+208/1=?简算