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

Toán Lớp 8: Tìm x, biết : 2x (x-3) +2 (5-x^2) = -2

Tháng Hai 2, 2023 Toán học 2 Comments 0 views

Toán Lớp 8: Tìm x, biết :
2x (x-3) +2 (5-x^2) = -2

Comments ( 2 )

  1. hoquyly
    hoquyly
    2 Tháng Hai, 2023 at 6:37 sáng
    Reply
    Answer
    2x . (x – 3) + 2 . (5 – x^2) = -2
    => 2x . x – 2x . 3 + 2 . 5 – 2 . x^2 = -2
    => 2x^2 – 6x + 10 – 2x^2 = -2
    => (2x^2 – 2x^2) – 6x + 10 = -2 
    => -6x + 10 = -2
    => -6x = -2 – 10
    => -6x = -12
    => x = (-12) : (-6)
    => x = 2
    $\text{Vậy}$ x = 2

  2. myngocla
    myngocla
    2 Tháng Hai, 2023 at 6:37 sáng
    Reply
    2x(x – 3) + 2(5 – x^2) = -2
    => 2x^2 – 6x + 10 – 2x^2 = -2
    => -6x = -2 – 10
    => -6x = -12
    => x = -12 : (-6)
    => x = 2
    Vậy x = 2

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

Khánh Ly

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