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

Toán Lớp 8: Rút gọn pthuc x^2+4x+3 ====– 2x+6

Toán Lớp 8: Rút gọn pthuc
x^2+4x+3
————–
2x+6

Comments ( 2 )

  1.    $\dfrac{ x² + 4x + 3 }{ 2x + 6 }$
    = $\dfrac{ x² + x + 3x + 3 }{ 2x + 2 . 3 }$
    = $\dfrac{ (x² + x )+ (3x + 3) }{ 2 . x + 2 . 3 }$
    = $\dfrac{ x.(x + 1 )+ 3.(x + 1) }{ 2 . ( x + 3 ) }$
    = $\dfrac{ ( x + 1 ) ( x + 3 ) }{ 2 . ( x + 3 ) }$
    = $\dfrac{ x + 1 }{ 2 }$
     

  2. Answer
    {x^{2} + 4x + 3}/{2x + 6} Đk : (x \ne -3)
    = {x^{2} + 3x + x + 3}/{2 . (x + 3)}
    = {(x^{2} + 3x) + (x + 3)}/{2 . (x + 3)}
    = {x . (x + 3) + (x + 3)}/{2 . (x + 3)}
    = {(x + 3) . (x + 1)}/{2 . (x + 3)}
    = {x + 1}/2
    $\text{Áp dụng:}$
    $\circledast$ $\text{Đặt nhân tử chung}$

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

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