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

Toán Lớp 10: Cho hs y= 3x²-4x+1. Tính: -b/2a , -Δ/2a.

Toán Lớp 10: Cho hs y= 3x²-4x+1.
Tính: -b/2a , -Δ/2a.

Comments ( 2 )

  1. $y=3x^2-4x+1$
    $Δ_y=4^2-4.3=4$
    $\dfrac{-b}{2a}=\dfrac{4}{6}=\dfrac23$
    $\dfrac{-\Delta}{2a}=\dfrac{-4}{6}=-\dfrac23$

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