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

Toán Lớp 8: x*(9x+1)-3x*(3x-5)=12x-5 hộ em vs ạ

Toán Lớp 8: x*(9x+1)-3x*(3x-5)=12x-5
hộ em vs ạ

Comments ( 2 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    ????(9????+1)−3????(3????−5)=12????−5
    9????^2+????−9????^2+15????=12????−5
    ????+15????=12????−5
    16????=12????−5
    16????−12????=12????−5−12????
    ????=−5/4
     

  2. x(9x+1)-3x(3x-5)=12x-5
    <=>9x^2+x-9x^2+15x-12x=-5
    <=>(9x^2-9x^2)+(x+15x-12x)=-5
    <=>4x=-5
    <=>x=-5/4
    vậy S={-5/4} 
     

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

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