(5x+1)-(5x-3).(5x+3)= 0

(5x+1)-(5x-3).(5x+3)= 0

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  1. (5x+1)-(5x-3).(5x+3)= 0

    ⇔(5x+1)-[ (5x)²-3²]=0

    ⇔(5x+1)-(25x²-9)=0

    ⇔5x+1-25x²+9=0

    ⇔-25x²+5x+10=0

    ⇔-5(5x²+x+2)=0

    ⇔5x²+x+2=0

    ⇒Δ=b²-4ac

    ⇔Δ=1²-4×5×2

    ⇔Δ=-39<0

    ⇒phương trình vô no

    xin câu trả lời hay nhất

     

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