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

Toán Lớp 8: Tìm x, biết: 6×2 – (2x + 5) – (3x – 2) = 7

Toán Lớp 8: Tìm x, biết:
6×2 – (2x + 5) – (3x – 2) = 7

Comments ( 2 )

  1. 6x^2 – (2x + 5) – (3x – 2) = 7
    => 6x^2 – ( 6x^2 + 15x – 4x – 10 ) = 7
    => 6x^2 – ( 6x^2 + 11x – 10 ) = 7
    => 6x^2 – 6x^2 – 11x + 10 = 7
    => 0 – 11 x + 10 = 7
    => -11x = 7 – 10
    => -11x = -3
    => x = (-3)/-11
    => x = 3/11
    Vậy x = 3/11

  2. Đáp án:
     
    Giải thích các bước giải:
     

    toan-lop-8-tim-biet-62-2-5-3-2-7

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