Bài 1 : Tính hợp lý B = 5/2.1 + 4/1.11 + 3/11.2 + 1/2.15 + 13/15.4 07/09/2021 Bởi Madeline Bài 1 : Tính hợp lý B = 5/2.1 + 4/1.11 + 3/11.2 + 1/2.15 + 13/15.4
$#Dino$ `B=5/(2.1)+4/(1.11)+3/(11.2)+1/(2.15)+13/(15.4)` `B/7=5/(1.2.7)+4/(1.7.11)+3/(11.7.2)+1/(7.2.15)+13/(15.7.4)` `B/7=5/(2.7)+4/(7.11)+3/(11.14)+1/(14.15)+13/(15.28)` `B/7=7/(2.7)-2/(2.7)+11/(7.11)-7/(711)+14/(11.14)-11/(11.14)+15/(14.15)-14/(14.15)+28/(15.28)-15/(15.28)` `B/7=1/2-1/7+1/7-1/11+…+1/15-1/28` `B/7=1/2-1/28` `B/7=13/28` `B=13/28:7=13/4` Bình luận
B=5/2.1+4/1.11+3/11.2+1/2.15+13/15.4 =>B/7=5/2.7+4/7.11+3/11.14+1/14.15+13/15.28 =>B/7=1/2-1/7+1/7-1/11+1/11-1/14+1/14-1/15+1/15-1/28 =>B/7=1/2-1/28=14/28-1/28=13/28 =>B=13/28.7=13/4 Bình luận
$#Dino$
`B=5/(2.1)+4/(1.11)+3/(11.2)+1/(2.15)+13/(15.4)`
`B/7=5/(1.2.7)+4/(1.7.11)+3/(11.7.2)+1/(7.2.15)+13/(15.7.4)`
`B/7=5/(2.7)+4/(7.11)+3/(11.14)+1/(14.15)+13/(15.28)`
`B/7=7/(2.7)-2/(2.7)+11/(7.11)-7/(711)+14/(11.14)-11/(11.14)+15/(14.15)-14/(14.15)+28/(15.28)-15/(15.28)`
`B/7=1/2-1/7+1/7-1/11+…+1/15-1/28`
`B/7=1/2-1/28`
`B/7=13/28`
`B=13/28:7=13/4`
B=5/2.1+4/1.11+3/11.2+1/2.15+13/15.4
=>B/7=5/2.7+4/7.11+3/11.14+1/14.15+13/15.28
=>B/7=1/2-1/7+1/7-1/11+1/11-1/14+1/14-1/15+1/15-1/28
=>B/7=1/2-1/28=14/28-1/28=13/28
=>B=13/28.7=13/4