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

Toán Lớp 9: Giải phương trình: √(x+1) + √(x-2) = 3

Toán Lớp 9: Giải phương trình: √(x+1) + √(x-2) = 3

Comments ( 2 )

  1. sqrt{x+1}+sqrt{x-2}=3 (xge2)
    <=>sqrt{x+1}=3-sqrt{x-2}
    <=>(sqrt{x+1})^2=(3-sqrt{x-2})^2
    <=>x+1=9-6sqrt{x-2}+x-2
    <=>6sqrt{x-2}=6
    <=>sqrt{x-2}=1
    <=>(sqrt{x-2})^2=1^2
    <=>x-2=1
    <=>x=3
    Vậy S={3}

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

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