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

Toán Lớp 7: `Tìm\ x:\ x – 10^2 = 2^2 . 3^2 . 5^2`

Toán Lớp 7: Tìm\ x:\ x – 10^2 = 2^2 . 3^2 . 5^2

Comments ( 2 )

  1. x-10^2=2^2. 3^2. 5^2
    ↔x-10^2=(2.3.5)^2
    ↔x-10^2=30^2
    ↔x-100=900
    ↔x=900+100
    ↔x=1000
    Vậy x=1000
     

  2. x – 10^2 = 2^2 . 3^2 . 5^2
    ⇒ x – 10^2 = (2 . 3 . 5)^2
    ⇒ x – 10^2 = 30^2
    ⇒ x = 30^2 + 10^2 = 900 + 100 = 1000
    Vậy  x = 1000

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