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

Toán Lớp 10: Tích các nghiệm của pt 2x+1/3x+2=x+1/x-2 là

Toán Lớp 10: Tích các nghiệm của pt 2x+1/3x+2=x+1/x-2 là

Comments ( 1 )

  1. $\dfrac{2x + 1}{3x + 2}$ = $\dfrac{x + 1}{x – 2}$
    = $\text{(2x + 1) (x – 2) = (3x + 2) (x + 1)}$
    = $\text{$2x^{2}$ – 3x -2 = $3x^{2}$ + 5x + 2}$
    = $\text{$x^{2}$ + 8x + 4 = 0}$
    $\longrightarrow$ $\left[\begin{matrix} -4 – 2\sqrt{3}\\ -4 + 2\sqrt{3}\end{matrix}\right.$
    $\longrightarrow$ $\text{ ( – 4 – 2$\sqrt{3}$) (- 4 + 2$\sqrt{3}$)}$
    $\text{ = 4 }$

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

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