=(1/1-1/2)+(1/2-1/3)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7) =(1/2-1/2)+(1/3-1/3)+(1/4-1/4)+(1/5-1/5)+(1/6-1/6)+(1/1-1/7) = 0+0+0+0+0+6/7 =6/7
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20 tháng 2 2022 lúc 15:41
M=1/2+1/6+1/12+1/20+1/30+1/42
1/2+1/6+1/12+1/20+1/30+1/42 =?
1/2 + 1/6 + 1/12 + 1/ 20 + 1/30/ + 1/42
1/42+1/30 +1/20 +1/12+1/6 +1/2
1/2+1/6+1/12+1/20+1/30+1/42=?
1/2+1/6+1/12+1/20+1/30+1/42
A = 1/2 + 1/6 + 1/12 + 1/20 + 1/30 + 1/42
A=1/2+1/6+1/12+1/20+1/30+1/42
1/2+1/6+1/12+1/20+1/30+1/42+...+1/110