phân tíc đa thức thành nhân tử
M=7 căn(x-1)-căn(x^3-x^2)+x-1
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\(=\left(x\sqrt{y}-y\sqrt{x}\right)+\left(x-y\right)\)
\(=\sqrt{xy}\left(\sqrt{x}-\sqrt{y}\right)+\left(\sqrt{x}-\sqrt{y}\right)\left(\sqrt{x}+\sqrt{y}\right)\)
\(=\left(\sqrt{x}-\sqrt{y}\right)\left(\sqrt{xy}+\sqrt{x}+\sqrt{y}\right)\)
\(x\sqrt{y}-y\sqrt{x}=\sqrt{x^2}.\sqrt{y}-\sqrt{y^2}.\sqrt{x}=\sqrt{xy}\left(\sqrt{x}-\sqrt{y}\right)\)
\(=\left(x\sqrt{x}+y\sqrt{y}\right)+\left(x-y\right)\)
\(=\left(\sqrt{x}+\sqrt{y}\right)\left(x-\sqrt{xy}+y\right)+\left(\sqrt{x}+\sqrt{y}\right)\left(\sqrt{x}-\sqrt{y}\right)\)
\(=\left(\sqrt{x}+\sqrt{y}\right)\left(x+y-\sqrt{xy}+\sqrt{x}-\sqrt{y}\right)\)
\(\sqrt{x}+\sqrt{y}+\sqrt{xy}+1\)
\(=\sqrt{x}+\sqrt{y}+\sqrt{x}.\sqrt{y}+1\)
\(=\sqrt{x}\left(\sqrt{y}+1\right)+\left(\sqrt{y}+1\right)\)
\(=\left(\sqrt{x}+1\right)\left(\sqrt{y}+1\right)\)
2). X-1= (√x-1).(√x+1)
3) a+√a= √a (√a+1)
Cac bn nho ung ho mk nha
a, \(x^2-6=x^2-\sqrt{6^2}=\left(x-\sqrt{6}\right)\left(x+\sqrt{6}\right)\)
b, \(x^2+2\sqrt{3}x+3=x^2+2\sqrt{3}x+\sqrt{3}=\left(x+\sqrt{3}\right)^2=\left(x+\sqrt{3}\right)\left(x+\sqrt{3}\right)\)
c, \(x^2-2\sqrt{5}x+5=x^2-2\sqrt{5}x+\sqrt{5}=\left(x-\sqrt{5}\right)^2=\left(x-\sqrt{5}\right)\left(x-\sqrt{5}\right)\)
\(x-y-\sqrt{x}-\sqrt{y}\\ =x-y-\left(\sqrt{x}+\sqrt{y}\right)\\ =\left(\sqrt{x}-\sqrt{y}\right)\left(\sqrt{x}+\sqrt{y}\right)-\left(\sqrt{x}+\sqrt{y}\right)\\ =\left(\sqrt{x}+\sqrt{y}\right)\left(\sqrt{x}-\sqrt{y}-1\right)\)
=(x-y)-(căn x+căn y)
=(căn x-căn y)(căn x+căn y)-(căn x+căn y)
=(căn x+căn y)(căn x-căn y-1)
\(M=7\sqrt{x-1}-\sqrt{x^3-x^2}+x-1\)
\(=7\sqrt{x-1}-\sqrt{x^2\left(x-1\right)}-\left(\sqrt{x-1}\right)^2\)
\(=\sqrt{x-1}\left(7-\sqrt{x^2}-\sqrt{x-1}\right)\)
\(=\sqrt{x-1}\)(7 - /x/ - \(\sqrt{x-1}\) )