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

Toán Lớp 6: Tìm số tự nhiên x 84 – 2(x+1)= 22

Toán Lớp 6: Tìm số tự nhiên x
84 – 2(x+1)= 22

Comments ( 2 )

  1. 84 – 2(x+1)= 22
    ⇔ 84 – 2x – 2 = 22
    ⇔ -2x = 22 + 2 – 84
    ⇔ -2x = -60
    ⇔ x = 30

  2. 84 – 2(x + 1) = 22
    ⇒ 2(x + 1) = 84 – 22 = 62
    ⇒ x + 1 = 62 : 2 = 31
    ⇒ x = 31 – 1 = 30
    Vậy   x = 30

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