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

Toán Lớp 9: Phân tích đa thức thành nhân tử: x – y – 3(√x + √y) Mn giúp e vs

Toán Lớp 9: Phân tích đa thức thành nhân tử: x – y – 3(√x + √y)
Mn giúp e vs

Comments ( 2 )

  1. Hướng dẫn trả lời:
    $\text{x – y – 3.($\sqrt{x}$ + $\sqrt{y}$).}$
    $\text{= $\sqrt{x^2}$ – $\sqrt{y^2}$ – 3.($\sqrt{x}$ + $\sqrt{y}$).}$
    $\text{= ($\sqrt{x}$ – $\sqrt{y}$).($\sqrt{x}$ + $\sqrt{y}$) – 3.($\sqrt{x}$ + $\sqrt{y}$).}$
    $\text{= [($\sqrt{x}$ – $\sqrt{y}$) – 3].($\sqrt{x}$ + $\sqrt{y}$).}$
    $\text{= ($\sqrt{x}$ – $\sqrt{y}$ – 3).($\sqrt{x}$ + $\sqrt{y}$).}$
    Giải đáp:
    $\text{= ($\sqrt{x}$ – $\sqrt{y}$ – 3).($\sqrt{x}$ + $\sqrt{y}$).}$

  2. #AkaShi
    x-y-3(\sqrt{x}+\sqrt{y})
    =(\sqrt{x})^2-(\sqrt{y})^2-3(\sqrt{x}+\sqrt{y})
    =(\sqrt{x}+\sqrt{y})(\sqrt{x}-\sqrt{y})-3(\sqrt{x}+\sqrt{y})
    =(\sqrt{x}+\sqrt{y})(\sqrt{x}-\sqrt{y}-3)
     

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