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

Toán Lớp 9: b√(4x-8)+4√(x-2)-1/3 √(9x-18) = 10

Toán Lớp 9: b√(4x-8)+4√(x-2)-1/3 √(9x-18) = 10

Comments ( 2 )

  1. Đáp án:
     
    Giải thích các bước giải:
     

    toan-lop-9-b-4-8-4-2-1-3-9-18-10

  2. Giải đáp:
    sqrt{4x-8}+4sqrt{x-2}-1/3sqrt{9x-18}=10 (x>=2)
    <=> 2sqrt{x-2}+4sqrt{x-2}-1/3 .3sqrt{x-2}=10
    <=> 2sqrt{x-2}+4sqrt{x-2}-sqrt{x-2}=10
    <=> 5sqrt{x-2}=10
    <=> sqrt{x-2}=2
    <=> x-2=4
    <=> x=6 (tmdk)
    Vậy S={6} 

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

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