phan tích đa thức thành nhân tử
\(x-y-3\left(\sqrt{x}+\sqrt{y}\right)\))
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\(=x+2\sqrt{xy}+y-9\)
\(=\left(\sqrt{x}+\sqrt{y}\right)^2-3^2\)
\(=\left(\sqrt{x}+\sqrt{y}-3\right)\left(\sqrt{x}+\sqrt{y}+3\right)\)
a: \(A=x\sqrt{x}-y\sqrt{y}+x\sqrt{y}-y\sqrt{x}\)
\(=\left(\sqrt{x}-\sqrt{y}\right)\left(x+\sqrt{xy}+y\right)+\sqrt{xy}\left(\sqrt{x}-\sqrt{y}\right)\)
\(=\left(\sqrt{x}-\sqrt{y}\right)\left(\sqrt{x}+\sqrt{y}\right)^2\)
b: \(B=5x^2-7x\sqrt{y}+2y\)
\(=5x^2-5x\sqrt{y}-2x\sqrt{y}+2y\)
\(=5x\left(x-\sqrt{y}\right)-2\sqrt{y}\left(x-\sqrt{y}\right)\)
\(=\left(x-\sqrt{y}\right)\left(5x-2\sqrt{y}\right)\)
\(2x^2-3x\sqrt{x+3}+\left(x+3\right)\)
\(=2x^2-2x\sqrt{x+3}-x\sqrt{x+3}+\left(\sqrt{x+3}\right)^2\)
\(=2x\left(x-\sqrt{x+3}\right)-\sqrt{x+3}\left(x-\sqrt{x+3}\right)\)
\(=\left(2x-\sqrt{x+3}\right)\left(x-\sqrt{x+3}\right)\)
\(2x^2-3x\sqrt{x+3}+\left(x+3\right)\)
\(=2x^2-x\sqrt{x+3}-2x\sqrt{x+3}+\left(\sqrt{x+3}\right)^2\)
\(=x\left(2x-\sqrt{x+3}\right)-\sqrt{x+3}\left(2x-\sqrt{x+3}\right)\)
\(=\left(x-\sqrt{x+3}\right)\left(2x-\sqrt{x+3}\right)\)
a, \(x^3-2x-y^3+2y\) (sửa đề)
\(=\left(x^3-y^3\right)-\left(2x-2y\right)\)
\(=\left(x-y\right)\left(x^2+xy+y^2\right)-2\left(x-y\right)\)
\(=\left(x-y\right)\left(x^2+xy+y^2-2\right)\)
b, \(\left(x-y\right)\left(x+y\right)-4zx+4yz\)
\(=\left(x-y\right)\left(x+y\right)-\left(4zx-4yz\right)\)
\(=\left(x-y\right)\left(x+y\right)-4z\left(x-y\right)\)
\(=\left(x-y\right)\left(x+y-4z\right)\)
Bạn xem lại đề câu a giúp mình nha!
\(x\sqrt{x}-3x+4\sqrt{x}-2=x\sqrt{x}-x-2x+2\sqrt{x}+2\sqrt{x}-2\)
\(=x\left(\sqrt{x}-1\right)-2\sqrt{x}\left(\sqrt{x}-1\right)+2\left(\sqrt{x}-1\right)\)
\(=\left(\sqrt{x}-1\right)\left(x-2\sqrt{x}+2\right)\)
1.x2-3=x2-(√3)2=(x-√3)(x+√3)
2.5x2−7y2=(√5x)2−(√7x)2=(√5x−√7x)(√5x+√7x)5x2−7y2=(5x)2−(7x)2=(5x−7x)(5x+7x)
3.x2-2xy+y2-z2+2zt-t2=(x2-2xy+y2)-(z2-2zt+t2)
=(x-y)2-(z-t)2=(x-y-z+t)(x-y+z-t)
4. x3-3x2+3x-1-y3 =(x3-3x2.1+3x.12-13)-y3=(x-1)3-y3
=(x-1-y)[(x-1)2+(x-1)y+y2]
=(x-y-1)(x2-2x+1+xy-y+y2)
am sorry nhầm đề
hok tốt