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

Toán Lớp 9: a, √14 + √4 + √25 b, 3√x -2√9x +√16x =5 c, √3x-1=4

Toán Lớp 9: a, √14 + √4 + √25
b, 3√x -2√9x +√16x =5
c, √3x-1=4

Comments ( 2 )

  1. Bạn tham khảo nhé.
    \sqrt{14}+\sqrt{4}+\sqrt{25}
    =\sqrt{14}+\sqrt{2^2}+\sqrt{5^2}
    =\sqrt{14}+|2|+|5|
    =\sqrt{14}+2+5
    =7+\sqrt{14}
     $\\$
    3\sqrt{x}-2\sqrt{9x}+\sqrt{16x}=5(x>=0)
    <=>3\sqrt{x}-2\sqrt{3^2 .x}+\sqrt{4^2 .x}=5
    <=>3\sqrt{x}-6\sqrt{x}+4\sqrt{x}=5
    <=>\sqrt{x}=5
    =>x=25(\text{Thỏa mãn})
    Vậy x=25
    $\\$
    \sqrt{3x-1}=4(x>=1/3)
    =>3x-1=4^2
    <=>3x-1=16
    <=>3x=17
    <=>x=17/3(\text{Thỏa mãn})
    Vậy x=17/3

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