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

Toán Lớp 6: a) x – 13 = – 17 b) – 4x – 100/20 = 19 c) (x-23). (14 + x) = 0

Toán Lớp 6: a) x – 13 = – 17
b) – 4x – 100/20 = 19
c) (x-23). (14 + x) = 0

Comments ( 2 )

  1. Tham khảo:
    a)
    x – 13 = -17
    x = ( -17 ) + 13
    x = -4
    b)
    -4x – (100)/(20) = 19
    -4x – 5 = 19
    -4x = 19 + 5
    -4x = 24
    x = 24 : ( -4 )
    x = -6
    c)
    ( x – 23 ) * ( 14 + x ) = 0
    TH1:\ x – 23 = 0
    x = 23 + 0
    x = 23
    TH2:\ 14 + x = 0
    x = 0 – 14
    x = 14
    => x \in { 23; -14 }
    $@Thanh$

  2. #Hugg
    a)x-13=-17
    ⇒x=-17+13
    ⇒x=-4
    Vậy x=-4
    b)\ -4x-100/20=19
    ⇒-4x-5=19
    ⇒-4x=5+19
    ⇒-4x=24
    ⇒x=(24)/(-4)
    ⇒x=-6
    Vậy x=-6
    c)\ (x-23)(14+x)=0
    $⇔\left[\begin{matrix} x-23=0\\ x+14=0\end{matrix}\right.$
    $⇔\left[\begin{matrix} x=23\\ x=-14\end{matrix}\right.$
    Vậy x=23 và x=-14
     

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

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