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

Toán Lớp 8: Tìm x x(2x + 1) – (x+1)(2x-3) = 0

Toán Lớp 8: Tìm x
x(2x + 1) – (x+1)(2x-3) = 0

Comments ( 2 )

  1. x(2x + 1) – (x+1)(2x-3) = 0
    ⇔ 2x² + x – (2x² – 3x + 2x – 3) = 0
    ⇔ 2x² + x – 2x² + 3x – 2x + 3 = 0
    ⇔ (2x² –  2x²) + (x + 3x – 2x) + 3 = 0
    ⇔ 2x + 3 = 0
    ⇔ 2x = – 3
    ⇔ x = $\dfrac{-3}{2}$ 
                            Vậy x = $\dfrac{-3}{2}$ 

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

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