1/3+2/8+2/15+2/24+2/35+2/48+2/63+2/80
人气:197 ℃ 时间:2020-03-28 16:47:53
解答
嗯,原式=2(1/8+1/24+1/48+1/80)+2(1/15+1/35+1/63)+1/3=2[1/(2*4)+1/(4*6)+1/(6*8)+1/(8*10)]+2[1/(3*5)+1/(5*7)+1/(7*9)]+1/3=[1/2-1/4+1/4-1/6+1/6-1/8+1/8-1/10]+[1/3-1/...
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