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

Toán Lớp 9: C= -2√x (x>0; x≠1) Tìm x nguyên để C nhận giá trị nguyên

Toán Lớp 9: C= -2√x (x>0; x≠1)
Tìm x nguyên để C nhận giá trị nguyên

Comments ( 1 )

  1. C ∈ Z
    <=> -2√x ∈ Z
    <=> √x ∈ Z
    <=> x ∈ {0,1,4,9,16,25,….}
    Mà x
    =>x ∈ {4,9,16,25,…..}

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