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

Toán Lớp 9: căn x + 3 / căn x-4 + 5 căn x + 12 / x-16

Toán Lớp 9: căn x + 3 / căn x-4 + 5 căn x + 12 / x-16

Comments ( 1 )

  1. (\sqrt{x}+3)/(\sqrt{x}-4)+(5\sqrt{x}+12)/(x-16)
    =((\sqrt{x}+3)(\sqrt{x}+4))/((\sqrt{x}-4)(\sqrt{x}+4))+(5\sqrt{x}+12)/((\sqrt{x}-4)(\sqrt{x}+4))
    =(x+4\sqrt{x}+3\sqrt{x}+12)/((\sqrt{x}-4)(\sqrt{x}+4))+(5\sqrt{x}+12)/((\sqrt{x}-4)(\sqrt{x}+4))
    =(x+7\sqrt{x}+12+5\sqrt{x}+12)/((\sqrt{x}-4)(\sqrt{x}+4))
    =(x+12\sqrt{x}+24)/(x-16)
     

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

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