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

Toán Lớp 12: 0,149= 44,5 ( 18^2 – 2,18 . 0,1x + 0,1^2 . x^2) Mọi người giúp đưa về dạng ax^2 + bx + c

Toán Lớp 12: 0,149= 44,5 ( 18^2 – 2,18 . 0,1x + 0,1^2 . x^2)
Mọi người giúp đưa về dạng ax^2 + bx + c

Comments ( 2 )

  1. $0,149= 44,5 ( 18² – 2,18 . 0,1x + 0,1² . x²)$
    $⇔0,149= 44,5 ( 324 – 0,218.x + 0,01x²)$
    $⇔0,149=44,5.324-44,5.0,218.x+44,5.0,01x²$
    $⇔0,149=14418-9,701x+0,445x²$
    $⇔0,445x²-9,701x+14417,851=0$
     

  2. $0,149=44,5(18^2-2,18.0,1x+0,1^2.x^2)$
    $\to 0,149=44,5(324-0,218x+0,01x^2)$
    $\to \dfrac{0,149}{44,5}=0,01x^2-0,218x+324$
    $\to 0,01x^2-0,218x+\left( 324-\dfrac{149}{44500}\right)=0$
    $\to 0,01x^2-0,218x+\dfrac{\text{ 14 417 851}}{44500}=0$
    PT vô nghiệm

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

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