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

Toán Lớp 9: rút gọn x – căn x \ x- 1 x-4 \ x- 4 căn x + 4 x căn y – y căn x \ x-y

Toán Lớp 9: rút gọn
x – căn x \ x- 1
x-4 \ x- 4 căn x + 4
x căn y – y căn x \ x-y

Comments ( 1 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    \frac{x-\sqrt{x}}{x-1}(x\ne1;x≥0)
    =\frac{\sqrt{x}(\sqrt{x}-1)}{(\sqrt{x}-1)(\sqrt{x}+1)}
    =\frac{\sqrt{x}}{\sqrt{x}+1}
    ————————————————
    \frac{x-4}{x-4\sqrt{x}+4}(x\ne4;x≥0)
    =\frac{(\sqrt{x}-2)(\sqrt{x}+2)}{(\sqrt{x}-2)^2}
    =\frac{\sqrt{x}+2}{\sqrt{x}-2}
     ————————————————
    \frac{x\sqrt{y}-y\sqrt{x}}{x-y}(x,y≥0;x\ney)
    =\frac{\sqrt{xy}(\sqrt{x}-\sqrt{y})}{(\sqrt{x}+\sqrt{y})(\sqrt{x}-\sqrt{y})}
    =\frac{\sqrt{xy}}{\sqrt{x}+\sqrt{y}}

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