Question

Phân tích biểu thức thành nhân tử

a) x-y

b) \(x-2\sqrt{x}\)

Answer 1

a )  \(x-y=\left(\sqrt{x}\right)^2-\left(\sqrt{y}\right)^2=\left(\sqrt{x}+\sqrt{y}\right)\left(\sqrt{x}-\sqrt{y}\right)\)

b )  \(x-2\sqrt{x}=\left(\sqrt{x}\right)^2-2\sqrt{x}=\sqrt{x}\left(\sqrt{x}-2\right)\)

Học tốt ~ 

Answer 2

a/ \(x-y=\left(\sqrt{x}-\sqrt{y}\right)\left(\sqrt{x}+\sqrt{y}\right)\)y )

b/ \(x-2\sqrt{x}\)

\(=\sqrt{x}\left(\sqrt{x}-2\right)\)

Answer 3

\(x-y=\left(\sqrt{x}\right)^2-\left(\sqrt{y}\right)^2=\left(\sqrt{x}-\sqrt{y}\right)\left(\sqrt{x}+\sqrt{y}\right)\)

\(x-2\sqrt{x}=\left(\sqrt{x}\right)^2-2\sqrt{x}.1+1^2-1^2\)

\(=\left(\sqrt{x}-1\right)^2-1^2\)

\(=\left(\sqrt{x}-1+1\right)\left(\sqrt{x}-1-1\right)\)

\(=\sqrt{x}.\left(\sqrt{x}-2\right)\)

Answer 4

 ありがとうございます~~。