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

Toán Lớp 6: Tìm x biết: a) x – 12 = 17 b) x – (– 7 ) = – 9 c) x – [(–5) + (–6)] = 20

Toán Lớp 6: Tìm x biết:
a) x – 12 = 17 b) x – (– 7 ) = – 9 c) x – [(–5) + (–6)] = 20

Comments ( 2 )

  1. a) x – 12 = 17
    ⇔x         = 17 + 12
    ⇔x         = 29
    Vậy x = 29
    b) x – (– 7 ) = – 9
    ⇔x             = -9 + (-7)
    ⇔x             = -16
    Vậy x = -16
    c) x – [(–5) + (–6)] = 20
    ⇔x – (-11)            = 20
    ⇔x                       = 20 + (-11)
    ⇔x                       = 9
    Vậy x = 9
    ——————-
    $Rinn$

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