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

Toán Lớp 7: Tìm x, bt: ` 15 – |x|/2 = 3/7 `

Toán Lớp 7: Tìm x, bt:
15 – |x|/2 = 3/7

Comments ( 2 )

  1. 15 – (|x|)/2 = 3/7
    (|x|)/2 = 15 – 3/7
    (|x|)/2 = 102/7
    (|x| . 7)/14 = 204/14
    => |x| . 7 = 204
    => |x| = 204 : 7
    => |x| = 204/7
    => x in {204/7; -204/7}
    Vậy x in {204/7; -204/7}
     

  2. 15- |x|/2=3/7
    |x|/2=15- 3/7
    |x|/2=102/7
    =>|x|.7=2.102
    =>|x|.7=204
    =>|x|=204:7
    =>|x|=204/7
    =>x=(+-204/7)
    Vậy x=(+-204/7)

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