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

Toán Lớp 8: Giúp mình bài này với : (x-1) ² < x(x-7)+6

Toán Lớp 8: Giúp mình bài này với : (x-1) ² < x(x-7)+6

Comments ( 2 )

  1. $(x-1) ² < x(x-7)+6$
    $⇒x²-2x+1<x²-7x+6$
    $⇒(x²-x²)-(2x-7x)<6-1$
    $⇒5x<5$
    $⇒x<1$
    $vậy$ $x<1$
     

  2. (x – 1)^2 < x(x – 7) + 6
    ⇔ x^2 – 2x + 1 < x^2 – 7x + 6
    ⇔ x^2 – 2x + 1 – x^2 + 7x < 6
    ⇔ 5x + 1 < 6
    ⇔ 5x < 5
    ⇔ x < 1
    Vậy  x < 1  thì  (x – 1)^2 < x(x – 7) + 6

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