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

Toán Lớp 9: Giải phương trình sau : a) √9x+27 – 1/4 √16x+48 + √x+3 = 6 b) 2+ √2x-1 =5

Toán Lớp 9: Giải phương trình sau :
a) √9x+27 – 1/4 √16x+48 + √x+3 = 6
b) 2+ √2x-1 =5

Comments ( 1 )

  1. a) \sqrt{9x+27}-1/4\sqrt{16x+48}+\sqrt{x+3}=6 (x>=-3)
    <=>\sqrt{9(x+3)}-1/4\sqrt{16(x+3)}+\sqrt{x+3}=6
    <=>3\sqrt{x+3}-\sqrt{x+3}+\sqrt{x+3}=6
    <=>3\sqrt{x+3}=6
    <=>\sqrt{x+3}=2
    <=>x+3=4
    <=>x=1 ™
    Vậy S={1}
    b) 2+\sqrt{2x-1}=5 (x>=1/2)
    <=>\sqrt{2x-1}=3
    <=>2x-1=9
    <=>2x=10
    <=>x=5 ™
    Vậy S={5}
     

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