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

Toán Lớp 9: a) 2/3 căn 9x -3 căn 4x = căn 25x- 16 b) 4 căn x+ 5 = 16 giúp mình với ạ

Toán Lớp 9: a) 2/3 căn 9x -3 căn 4x = căn 25x- 16
b) 4 căn x+ 5 = 16
giúp mình với ạ

Comments ( 1 )

  1. a)2/3\sqrt{9x}-3\sqrt{4x}=\sqrt{25x}-16(xge0)
    ->2/3. 3\sqrt{x}-3.2\sqrt{x}=5\sqrt{x}-16
    ->2\sqrt{x}-6\sqrt{x}-5\sqrt{x}=-16
    ->-9\sqrt{x}=-16
    ->\sqrt{x}=16/9
    ->x=4/3
    b)4\sqrt{x+5}=16(ĐK:x ge -5)
    ->\sqrt{x+5}=4
    ->x+5=16
    ->x=11
     

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

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