A=-20/11.13-20/13.15-20/15.17-20/17.19-…-20/53.55 THANKS 08/10/2021 Bởi Nevaeh A=-20/11.13-20/13.15-20/15.17-20/17.19-…-20/53.55 THANKS
Đáp án: Giải thích các bước giải: `A` `=` `(-20)/(11.13)` `-` `20/(13.15)` `-` `20/(15.17)` `-` `20/(17.19)` `…..` `-20/(53.55)` `A` `=` `(-20)/(11.13)` `+` `(-20)/(13.15)` `+` `(-20)/(15.17)` `+` `(-20)/(17.19)` `…..` `(-20)/(53.55)` `-1/10` `A` `=` `2/(11.13)` `+` `2/(13.15)` `+` `2/(15.17)` `+` `(2)/(17.19)` `……` `2/(53.55` `(-1)/10` `A` `=` `1/11` `-` `1/13` `+1/13` `-1/15` `+1/15-1/17` `+1/17` `-1/19` `…….` `1/53` `-` `1/55` `(-1)/10` `A` `=` `1/11` `-` `1/55` `(-1)/10` `A` `=` `5/11` `-` `1/55` `(-1)/10` `A` `=` `4/55` `A` `=` `4/55` `.` `(-10)` `A` `=` `(-40)/55` `A` `=` `(-8)/11` Vậy `A` `=` `(-8)/11` CHÚC BẠN HỌC TỐT Bình luận
A=-20/11.13-20/13.15-20/15.17-20/17.19-…-20/53.55 =-(20/11.13+20/13.15+20/15.17+20/17.19+…+20/53.55) =-10(1/11-1/13+1/13-1/15+1/15-1/17+…+1/53-1/55) =-10(1/11-1/15) =-10.4/55 =-8/11 Vậy A=-8/11 Học tốt nha Bình luận
Đáp án:
Giải thích các bước giải:
`A` `=` `(-20)/(11.13)` `-` `20/(13.15)` `-` `20/(15.17)` `-` `20/(17.19)` `…..` `-20/(53.55)`
`A` `=` `(-20)/(11.13)` `+` `(-20)/(13.15)` `+` `(-20)/(15.17)` `+` `(-20)/(17.19)` `…..` `(-20)/(53.55)`
`-1/10` `A` `=` `2/(11.13)` `+` `2/(13.15)` `+` `2/(15.17)` `+` `(2)/(17.19)` `……` `2/(53.55`
`(-1)/10` `A` `=` `1/11` `-` `1/13` `+1/13` `-1/15` `+1/15-1/17` `+1/17` `-1/19` `…….` `1/53` `-` `1/55`
`(-1)/10` `A` `=` `1/11` `-` `1/55`
`(-1)/10` `A` `=` `5/11` `-` `1/55`
`(-1)/10` `A` `=` `4/55`
`A` `=` `4/55` `.` `(-10)`
`A` `=` `(-40)/55`
`A` `=` `(-8)/11`
Vậy `A` `=` `(-8)/11`
CHÚC BẠN HỌC TỐT
A=-20/11.13-20/13.15-20/15.17-20/17.19-…-20/53.55
=-(20/11.13+20/13.15+20/15.17+20/17.19+…+20/53.55)
=-10(1/11-1/13+1/13-1/15+1/15-1/17+…+1/53-1/55)
=-10(1/11-1/15)
=-10.4/55
=-8/11
Vậy A=-8/11
Học tốt nha