6/1×3 6/3×5 + 6/5×7 +…+6/2017 x 2019 Help me!!! 06/12/2021 Bởi Camila 6/1×3 6/3×5 + 6/5×7 +…+6/2017 x 2019 Help me!!!
`6/(1.3)+6/(3.5)+6/(5.7)+…………………..+6/(2017.2019)` `=3(2/(1.3)+2/(3.5)+2/(5.7)+……………….+2/(2017.2019))` `=3(1-1/3+1/3-1/5+1/5-1/7+……………+1/2017-1/2019)` `=3(1-1/2019)` `=3. 2018/2019=2018/673` Bình luận
Giải thích các bước giải:
`6/(1.3)+6/(3.5)+6/(5.7)+…………………..+6/(2017.2019)`
`=3(2/(1.3)+2/(3.5)+2/(5.7)+……………….+2/(2017.2019))`
`=3(1-1/3+1/3-1/5+1/5-1/7+……………+1/2017-1/2019)`
`=3(1-1/2019)`
`=3. 2018/2019=2018/673`