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

Toán Lớp 8: Cho A = x-1/2 Tìm x để A > 0; A < 0

Toán Lớp 8: Cho A = x-1/2
Tìm x để A > 0; A < 0

Comments ( 2 )

  1. A = \frac{x – 1}{2}
    Để A > 0 thì
    x – 1 > 0
    => x > 1
    Để A < 0 thì 
    x – 1 < 0
    => x < 1

  2. $*,$ Để $A>0$
    $⇒\dfrac{x-1}{2}>0$
    $⇒x-1>0$
    $⇒x>1$
    Vậy $x>1$ thì $A>0$
    $*,$ Để $A<0$
    $⇒\dfrac{x-1}{2}<0$
    $⇒x-1<0$
    $⇒x<1$
    Vậy $x<1$ thì $A<0$

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

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