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

Toán Lớp 7: `(x^2-5+3)-(x^2-x+1)=x-4` `x^2+10x+7=x^2-2x+1/2`

Toán Lớp 7: (x^2-5+3)-(x^2-x+1)=x-4
x^2+10x+7=x^2-2x+1/2

Comments ( 2 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    (x^2-5x+3)-(x^2-x+1)=x-4
    -> x^2 – 5x + 3 – x^2 + x – 1 = x – 4
    -> -4x+2 = x – 4
    -> -4x = x – 6
    -> -5x = -6
    -> x = 6/5
    Vậy x \in {6/5}
    x^2+10x+7=x^2-2x+1/2
    -> 10x + 7 = -2x + 1/2
    -> 10x = -2x – 13/2
    -> 12x = -13/2
    -> x = -13/24
    Vậy x \in {-13/24}

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

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