A=1/199-1/198×199-1/198×197-1/197×196-…-1/3×2-1/2×1 B=1-2/3×5-2/5×7-2/7×9-…-2/61×63-2/63×65 Các bạn làm hộ mình AvàB nhé

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1. `A=1/199-1/(198.199)-1/(198.197)-1/(197.196)-…-1/(3.2)-1/(2.1)`

   `A=1/199- (1/(198.199)+1/(198.197)+1/(197.196)+…+1/(3.2)+1/(2.1))`

   `A=1/199- (1/(1.2)+1/(2.3)+…+1/(196.197)+1/(197.198)+1/(198.199))`

   `A=1/199- (1- 1/2+ 1/2- 1/3+ 1/3-…-1/196+ 1/196- 1/197+ 1/197- 1/198+ 1/198- 1/199)`

   `A=1/199- [1+(1/2- 1/2)+(1/3- 1/3)+…+(1/196- 1/196)+(1/197- 1/197)+(1/198- 1/198)-1/199]`

   `A=1/199-(1+0+0+…+0+0+0- 1/199)`

   `A=1/199-(1- 1/199)`

   `A=1/199- 1+ 1/199`

   `A=1/199- 199/199+ 1/199`

   `A=-197/199

   `B=1-2/(3.5)-2/(5.7)-2/(7.9)-…-2/(61.63)-2/(63.65)`

   `B=1-(2/(3.5)+2/(5.7)+2/(7.9)+…+2/(61.63)+2/(63.65))`

   `B=1-(1/(3.5)+1/(5.7)+1/(7.9)+…+1/(61.63)+1/(63.65))`

   `B=1-(1/3- 1/5+ 1/5- 1/7+ 1/7- 1/9+ 1/9-…- 1/61+ 1/61- 1/63+ 1/63- 1/65)`

   `B=1-[1/3+(1/5- 1/5)+(1/7- 1/7)+(1/9- 1/9)+…+(1/61- 1/61)+(1/63- 1/63)- 1/65]`

   `B=1-(1/3+ 0+0+0+…+0+0- 1/65)`

   `B=1-(1/3- 1/65)`

   `B=1-(65/195- 3/195)`

   `B=1- 62/195`

   `B=195/195- 62/195`

   `B=133/195`

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