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\(\dfrac{x^2+3xy+2y^2}{x^3+2x^2y-xy^2-2y^3}\)
\(=\dfrac{\left(x+y\right)\left(x+2y\right)}{x\left(x^2-y^2\right)+2y\left(x^2-y^2\right)}\)
\(=\dfrac{x+y}{x^2-y^2}\)
\(=\dfrac{1}{x-y}\)
\(\frac{\left(x-1\right)^3}{x^2y-xy-x+1}=\frac{\left(x-1\right)^3}{xy\left(x-1\right)-\left(x-1\right)}=\frac{\left(x-1\right)^3}{\left(xy-1\right)\left(x-1\right)}=\frac{\left(x-1\right)^2}{xy-1}=\frac{x^2-2x+1}{xy-1}\)
a)\(\dfrac{x^2-4xy+4y^2}{xy-2y^2}\)
=\(\dfrac{x^2-4xy+\left(2y\right)^2}{y\left(x-2y\right)}\)
=\(\dfrac{\left(x-2y\right)^2}{y\left(x-2y\right)}\)
=\(\dfrac{x-2y}{y}\)
b)\(\dfrac{x^3-36x}{x^2+6x}\)
=\(\dfrac{x\left(x^2-6^2\right)}{x\left(x+6\right)}\)
=\(\dfrac{x\left(x+6\right)\left(x-6\right)}{x\left(x+6\right)}\)
= \(x-6\)
#Fiona
Chúc bạn học tốt !
\(b,=\dfrac{x\left(x^2-xy+y^2\right)}{\left(x+y\right)\left(x^2-xy+y^2\right)}=\dfrac{x}{x+y}\left(x\ne-y\right)\\ c,=\dfrac{2x\left(x+1\right)\left(x-2\right)^2}{x\left(x-2\right)\left(x+2\right)\left(x+1\right)}=\dfrac{2\left(x-2\right)}{x+2}\left(x\ne-1;x\ne\pm2;x\ne0\right)\)
b: \(\dfrac{x^3-x^2y+xy^2}{x^3+y^3}=\dfrac{x\left(x^2-xy+y^2\right)}{\left(x+y\right)\left(x^2-xy+y^2\right)}=\dfrac{x}{x+y}\)
c: \(\dfrac{\left(2x^2+2x\right)\left(x-2\right)^2}{\left(x^3-4x\right)\left(x+1\right)}=\dfrac{2x\left(x+1\right)\left(x-2\right)^2}{x\left(x-2\right)\left(x+2\right)\left(x+1\right)}=\dfrac{2\left(x-2\right)}{x+2}\)
\(\frac{xy^3-x^2y}{x^2+xy}=\frac{xy\left(y^2-x\right)}{x\left(x+y\right)}=\frac{y\left(y^2-x\right)}{x+y}=\frac{y^3-xy}{x+y}\)