tính tổng 4/2.4+4/4.6+4/6.8+…+4/2008.2010 27/08/2021 Bởi Maya tính tổng 4/2.4+4/4.6+4/6.8+…+4/2008.2010
`4/2.4+4/4.6+4/6.8+…+4/2008.2010` `=2(2/2.4+2/4.6+2/6.8+…+2/2008.2010)` `=2(1/2-1/4+1/4-1/6+1/6-1/8+…+1/2008-1/2010)` `=2(1/2-1/2010)` `=2(1005/2010-1/2010)` `=2(1004/2010)` `=2008/2010` `=1004/1005` Bình luận
@Học để làm gì ? `4/(2.4)+4/(4.6)+4/(6.8)+…+4/(2008.2010)` `=4/2 . [1/(2.4)+1/(4.6)+1/(6.8)+…+1/(2008.2010)]` `=2.[(1/2 – 1/4) + (1/4-1/6) +(1/6 -1/8) +….+(1/2008 – 1/2010)]` `=2.[1/2 – 1/2010]` `= 2 . [1005/2010 – 1/2010]` `= 2 . 1004/2010` `= 2008/2010` `=1004/1005` `#Study well` Bình luận
`4/2.4+4/4.6+4/6.8+…+4/2008.2010`
`=2(2/2.4+2/4.6+2/6.8+…+2/2008.2010)`
`=2(1/2-1/4+1/4-1/6+1/6-1/8+…+1/2008-1/2010)`
`=2(1/2-1/2010)`
`=2(1005/2010-1/2010)`
`=2(1004/2010)`
`=2008/2010`
`=1004/1005`
@Học để làm gì ?
`4/(2.4)+4/(4.6)+4/(6.8)+…+4/(2008.2010)`
`=4/2 . [1/(2.4)+1/(4.6)+1/(6.8)+…+1/(2008.2010)]`
`=2.[(1/2 – 1/4) + (1/4-1/6) +(1/6 -1/8) +….+(1/2008 – 1/2010)]`
`=2.[1/2 – 1/2010]`
`= 2 . [1005/2010 – 1/2010]`
`= 2 . 1004/2010`
`= 2008/2010`
`=1004/1005`
`#Study well`