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

Toán Lớp 7: Tìm x biết: a)2

Toán Lớp 7: Tìm x biết: a)2

Comments ( 2 )

  1. a)
    2 < x < 5/2
    ⇔ 8/4 <x < 10/4
    ⇒ x = 9/4
    b)
    -10/3 < x < -3
    ⇔ -20/6 < x < -18/6
    ⇒ x = -19/6
    c)
    -1 < x < 0
    ⇒ -1 + 2 < x + 2 < 0 + 2
    ⇒ 1 < x + 2 < 2
    ⇒ 2 < 2(x + 2) < 4
    ⇒ 2(x + 2) = 3
    ⇒ x + 2 = 3/2
    ⇒ x = -1/2

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

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