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

Toán Lớp 9: tìm x biết : √6 − 4x + x ^2 − x = 4

Toán Lớp 9: tìm x biết :
√6 − 4x + x ^2 − x = 4

Comments ( 1 )

  1. Giải đáp:
    $\sqrt{6-4x+x^2}-x=4$
    $⇔\sqrt{6-4x+x^2}=4+x$
    $⇔6-4x+x^2=(4+x)^2$
    $⇔6-4x+x^2=16+8x+x^2$
    $⇔12x=-10$
    $⇔x=\dfrac{-5}{6}(t/m)$
    Vậy………..
     

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

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