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

Toán Lớp 8: 2.x^2+3.(x-1).(x+1)=5x(x+1) Tìm X

Toán Lớp 8: 2.x^2+3.(x-1).(x+1)=5x(x+1)
Tìm X

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    2x²+3(x-1)(x+1)=5x(x+1)
    ⇔2x²+3(x²+x-x-1)=5x²+5x
    ⇔2x²+3x²+3x-3x-3-(5x²+5x)=0
    ⇔2x²+3x²+3x-3x-3-5x²-5x=0
    ⇔-5x-3=0
    ⇔-5x=3
    ⇔x=-3/5
       Vậy S={-3/5}
          Chúc bn hc tốt????
                $\text{#LinhSad}$
         
     

  2. $(=) 2x^2 + (x^2-1) = 5x^2 + 5x$
    $(=) 2x^2 + 3x^2 – 3= 5x^2 + 5x$
    $(=) 5x^2 – 3 = 5x^2 + 5x$
    $(=) 5x=-3$
    $=) x=-3/5$

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

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