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

Toán Lớp 8: tìm x (x-2)(x+1)-x^2+3x=0 nhanh giúp tớ nha

Toán Lớp 8: tìm x (x-2)(x+1)-x^2+3x=0
nhanh giúp tớ nha

Comments ( 2 )

  1. $y10000$ 
     ( x – 2 )( x + 1 ) – x² + 3x = 0 
    <=> x² + x – 2x – 2 – x² + 3x =0 
    <=> 2x – 2 = 0 
    <=> 2x = 2 
    <=> x = 1 
    Vậy x = 1
     

  2. ( x – 2 )( x + 1 ) – x^2 + 3x = 0
    ( x^2 + x – 2x – 2 ) – x^2 + 3x = 0
    x^2 + x – 2x – 2 – x^2 + 3x = 0
    2x – 2= 0
    2x = 2  
        x = 2 : 2 
         x= 1
    Vậy x = 1

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

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