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

Toán Lớp 8: Bài 2: Tìm x : (3x-5) (7-5x) + 15x^2=2x+1

Tháng Mười Hai 15, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: Bài 2: Tìm x : (3x-5) (7-5x) + 15x^2=2x+1

Comments ( 2 )

  1. thienthanh
    thienthanh
    15 Tháng Mười Hai, 2022 at 10:29 sáng
    Reply
    (3x-5)(7-5x)+15x^2=2x+1
    ⇔3x.7-5x.3x-5.7+5.5x+15x^2=2x+1
    ⇔21x-15x^2-35+25x+15x^2=2x+1
    ⇔(15x^2-15x^2)+(25x+21x)-35=2x+1
    ⇔46x-35-2x-1=0
    ⇔44x=36
    ⇔x=36/44
    ⇔x=9/11
    Vậy x=9/11

  2. diemchau
    diemchau
    15 Tháng Mười Hai, 2022 at 10:29 sáng
    Reply
    (3x – 5)(7 – 5x) + 15x^2 = 2x – 1
    46x – 15x^2 – 35 + 15x^2 = 2x – 1
    46x – 35 = 2x – 1
    46x – 35 – 2x = 1
    46x – 2x = 1 + 35
    44x = 36
    x = 9/11
    Vậy x = 9/11

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

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