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问题：【1+1/3+1/6+1/10+1/15+1/21+1/28求答案】
答案：↓↓↓ 马峻峰的回答： 网友采纳 1+1／3+1／6+1／10+1／15+1／21+1／28 =1+2*(1/6+1/12+1/20+1/30+1/42+1/56) =1+2*(1/2*3+1/3*4+1/4*5+1/5*6+1/6*7+1/7*8) =1+2*(1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8) =1+2*(1/2-1/8) =1+2*3/8 =1+3/4=7/4 | 
