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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: Tìm X a). x^2-x+1/4=0 b). 121x^2-22x+1=0

Home/ Toán Lớp 8: Tìm X a). x^2-x+1/4=0 b). 121x^2-22x+1=0

Toán Lớp 8: Tìm X a). x^2-x+1/4=0 b). 121x^2-22x+1=0

Tháng Bảy 15, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: Tìm X
a). x^2-x+1/4=0
b). 121x^2-22x+1=0

Comments ( 2 )

  1. khanhlanchau
    khanhlanchau
    15 Tháng Bảy, 2022 at 5:06 chiều
    Reply
    a) x² – x + 1/4 = 0
    ⇔ (x – 1/2)² = 0
    ⇔ x – 1/2 = 0
    ⇔ x = 1/2
    b) 121x² – 22x + 1 = 0
    ⇔ (11x – 1)² = 0
    ⇔ 11x – 1 = 0
    ⇔ 11x = 1
    ⇔ x = 1/11

  2. lanthuhoa
    lanthuhoa
    15 Tháng Bảy, 2022 at 5:06 chiều
    Reply
    a)
    x^2-x+1/4=0
    <=>x^2-2. 1/2.x+(1/2)^2=0
    <=>(x-1/2)^2=0
    =>x-1/2=0
    <=>x=1/2
    vậy S={1/2}
    b)
    121x^2-22x+1=0
    <=>(11x)^2-2.11x.1+1^2=0
    <=>(11x-1)^2=0
    =>11x-1=0
    <=>11x=1
    <=>x=1/11
    vậy S={1/11} 
     

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222-9+11+12:2*14+14 = ? ( )

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