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

Toán Lớp 8: a) 5x(12x + 7) – 3x(20x – 5) = – 100 giúp mk vs

Toán Lớp 8: a) 5x(12x + 7) – 3x(20x – 5) = – 100
giúp mk vs

Comments ( 2 )

  1. 5x(12x+7)-3x(20x-5)=-100
    ⇔60x^2+35x-60x^2+15x=-100
    ⇔(60x^2-60x^2)+(35x+15x)=-100
    ⇔50x=-100⇒x=-2
     

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    $5x(12x+7)-3x(20x-5)=-100$
    $⇔60x²+35x-60x²+15x=-100$
    $⇔50x=-100$
    $⇔x=-2$

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

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