Toán tìm x biết : (1/2 + 1/6 + 1/8 +1/16) : x = 1/2 +1/6 +1/12 +1/20 +… + 1/132 10/09/2021 By Kennedy tìm x biết : (1/2 + 1/6 + 1/8 +1/16) : x = 1/2 +1/6 +1/12 +1/20 +… + 1/132
Đáp án: Ta có : Vế phải: `1/2 +1/6 +1/12 +1/20 +… + 1/132` `= 1/1.2 + 1/2.3 + 1/3.4 + 1/4.5 + .. +1/11.12` `= 1 – 1/2 + 1/2 – 1/3 + 1/3 – 1/4 + 1/4 – 1/5 + … + 1/11 – 1/12` `= 1 – 1/12` `= 11/12` Vế trái: `(1/2 + 1/6 + 1/8 +1/16) ` `= 41/48` Ta lại có : `(1/2 + 1/6 + 1/8 +1/16) : x = 1/2 +1/6 +1/12 +1/20 +… + 1/132` `41 / 48 : x = 11/12` `x = 41/48 : 11/12 ` `x = 41/44` Chúc bn học tốt ! Cho mình câu trả lời hay nhất nhé Mơn ^ω^ @Jimmykoduvn #Knock Down AnyBody Trả lời
(1/2 + 1/6 + 1/8 +1/16) : x = 1/2 +1/6 +1/12 +1/20 +… + 1/132 41/48:x=1/2 +1/6 +1/12 +1/20 +… + 1/132 41/48:x=1/1×2+1/2×3+1/3×4+……+1/11×12 41/48:x=1-1/2+1/2-1/3+1/3-1/4+…..+1/11-1/12 41/48:x=1-1/12 41/48:x=11/12 x=41/48:11/12 x=41/44 Trả lời
Đáp án:
Ta có :
Vế phải:
`1/2 +1/6 +1/12 +1/20 +… + 1/132`
`= 1/1.2 + 1/2.3 + 1/3.4 + 1/4.5 + .. +1/11.12`
`= 1 – 1/2 + 1/2 – 1/3 + 1/3 – 1/4 + 1/4 – 1/5 + … + 1/11 – 1/12`
`= 1 – 1/12`
`= 11/12`
Vế trái:
`(1/2 + 1/6 + 1/8 +1/16) `
`= 41/48`
Ta lại có :
`(1/2 + 1/6 + 1/8 +1/16) : x = 1/2 +1/6 +1/12 +1/20 +… + 1/132`
`41 / 48 : x = 11/12`
`x = 41/48 : 11/12 `
`x = 41/44`
Chúc bn học tốt !
Cho mình câu trả lời hay nhất nhé
Mơn ^ω^
@Jimmykoduvn
#Knock Down AnyBody
(1/2 + 1/6 + 1/8 +1/16) : x = 1/2 +1/6 +1/12 +1/20 +… + 1/132
41/48:x=1/2 +1/6 +1/12 +1/20 +… + 1/132
41/48:x=1/1×2+1/2×3+1/3×4+……+1/11×12
41/48:x=1-1/2+1/2-1/3+1/3-1/4+…..+1/11-1/12
41/48:x=1-1/12
41/48:x=11/12
x=41/48:11/12
x=41/44