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

Toán Lớp 8: tìm x 2x(x – 2) – (x – 3)(2x + 1) = 7

Toán Lớp 8: tìm x 2x(x – 2) – (x – 3)(2x + 1) = 7

Comments ( 2 )

  1. 2x(x-2)-(x-3)(2x+1)=7
    <=>(2x^2-4x)-(2x^2+x-6x-3)-7=0
    <=>2x^2-4x-(2x^2-5x-3)-7=0
    <=>2x^2-4x-2x^2+5x+3-7=0
    <=>x-4=0
    <=>x=4
    Vậy x=4

  2. ~ Bạn tham khảo ~
    2x(x-2)-(x-3)(2x+1)=7
    <=> 2x^2-4x-(2x^2+x-6x-3)-7=0
    <=> 2x^2-4x-2x^2-x+6x+3-7=0
    <=> x-4=0
    <=> x=4
    Vậy S={4}

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