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

Toán Lớp 8: Tìm x biết a. 3^2 + 6x = 0 b. 64^3 – 48^2 + 12x – 28 = 0

Toán Lớp 8: Tìm x biết
a. 3^2 + 6x = 0
b. 64^3 – 48^2 + 12x – 28 = 0

Comments ( 2 )

  1. Lời giải và giải thích chi tiết:
    a, 3^2 +6x =0
    <=> 9 + 6x =0
    <=> 6x = -9
    <=> x = -3/2
    Vậy: x = -3/2
    b, 64^3 – 48^2 +12x -28 = 0
    <=> 12x = -64^3 + 48^2 + 28
    <=> 12x = -259812
    <=> x = -21651
    Vậy: $x =-21651$

  2. a) 3² +6 x =0
    9 +6x = 0
    6x = 0-9
    6x=-9
    x=-9:6
    x=-1,5
    b)64³-48²+12x-28=0
    262144-2304+12x-28=0
    259840+12x-28=0
    12x-28=0-259840
    12x-28=-259840
    12x=-259840 +28
    12x=-259812
    x=-259812 : 12
    x=-21651
     

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

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