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

Toán Lớp 8: 2x(x-5)-x(2x+3)=39 giúp mk lẹ i

Toán Lớp 8: 2x(x-5)-x(2x+3)=39
giúp mk lẹ i

Comments ( 2 )

  1. 2x.(x-5)-x.(2x+3)=39
    =>2x.x-2x.5-x.2x-x.3=39
    =>2x^2-10x-2x^2-3x=39
    =>(2x^2-2x^2)-(10x+3x)=39
    =>-13x=39
    =>x=39:(-13)
    =>x=-3
    Vậy x=-3

  2. 2x(x-5)-x(2x+3)=39
    <=>2x^2-10x-2x^2-3x=39
    <=>-13x=39
    <=>x=-3
    Vậy x=-3
     

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

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