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

Toán Lớp 8: 92x-1)(x-5) -2 $x^{2}$ + 10x – 25 = 0

Toán Lớp 8: 92x-1)(x-5) -2 $x^{2}$ + 10x – 25 = 0

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    (2x-1)(x-5)-2x²+10x-25=0
    =>2x²-10x+5-2x²+10x-25=0
    =>(2x²-2x²)+(10x-10x)-5+25=0
    =>0+0-5+25=0
    => -20=0 (vô lí)
    Vậy x∈\phi
     

  2. ( 2x – 1 )( x – 5 ) – 2x^2 + 10x – 25 = 0
    <=> 2x^2 – 10x + 5 – 2x^2 + 10x – 25 = 0
    <=> ( 2x^2 – 2x^2 ) + ( -10x + 10x ) + ( 5 – 25 ) = 0
    <=> 0 + 0 + ( -20 ) = 0     $\text{ ( vô lí ) }$
             $Vậy$ x ∈ ∅
     

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