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

Toán Lớp 7: |5/2X-3|-7/2=1/4 Làm ơn giúp mình nhá

Toán Lớp 7: |5/2X-3|-7/2=1/4
Làm ơn giúp mình nhá

Comments ( 2 )

  1. |5/2x-3|-7/2=1/4
    |5/2x-3|=1/4+7/2
    |5/2x-3|=15/4
    TH1:5/2x-3=15/4
    ⇔5/2x=15/4+3
    ⇔5/2x=27/4
    ⇔ x=27/10
    TH2:5/2x-3=-15/4
    ⇔ 5/2x=-15/4+3
    ⇔ 5/2x=-3/4
    ⇔x=-3/10
    Vậy x∈{27/10;-3/10}

  2. |5/2 x – 3| – 7/2 = 1/4
    | 5/2x – 3| = 1/4 + 7/2
    |5/2 x – 3| = 15/4
    ⇒ +) 5/2 . x – 3 = 15/4
    5/2 . x = 15/4 + 3
    5/2 . x = 27/4
    x = 27/4 : 5/2
    x= 27/10
    +) 5/2 . x – 3 = -15/4
    5/2 . x = -15/4 + 3
    5/2 . x = -3/4
    x = -3/4 : 5/2
    x= -3/10
    Vậy x ∈ { 27/10 ; -3/10}

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

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