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Ta có: \(\frac{y^2-x^2}{x^3-3x^2y+3xy^2-y^3}\)
= \(\frac{\left(y-x\right)\left(y+x\right)}{\left(x-y\right)^3}\)
=\(-\frac{x+y}{\left(x-y\right)^2}\)
=\(-\frac{x+y}{x^2-2xy+y^2}\)
\(\frac{y^2-x^2}{x^3-3x^2y+3xy^2-y^3}\)
\(=\frac{\left(y-x\right)\left(y+x\right)}{\left(x-y\right)^3}\)
\(=-\frac{\left(x-y\right)\left(x+y\right)}{\left(x-y\right)^3}\)
\(=-\frac{x+y}{\left(x-y\right)^2}\)
a)\(\frac{4x+1}{3x}\)+\(\frac{2x-3}{6x}\)=\(\frac{2\left(4x+1\right)}{2.3x}\)+\(\frac{2x-3}{6x}\)=\(\frac{8x+2}{6x}\)+\(\frac{2x-3}{6x}\)=\(\frac{8x+2+2x-3}{6x}\)=\(\frac{10x-1}{6x}\)
b)\(\frac{x^2-y^2}{6x^2y^2}\):\(\frac{x+y}{3xy}\)=\(\frac{\left(x+y\right)\left(x-y\right)}{6x^2y^2}\) . \(\frac{3xy}{x+y}\)=\(\frac{\left(x+y\right)\left(x-y\right)3xy}{6x^2y^2\left(x+y\right)}\)=\(\frac{x-y}{2xy}\)
Ta có :
\(VT=\frac{y^2-x^2}{x^3-3x^2y+3xy^2-y^3}=\frac{\left(y-x\right)\left(y+x\right)}{\left(x-y\right)^3}\)
\(VT=\frac{-\left(x-y\right)\left(x+y\right)}{\left(x-y\right)^3}=\frac{-\left(x+y\right)}{\left(x-y\right)^2}=\frac{-x-y}{\left(x-y\right)^2}=VP\)
Vậy .......................
\(\frac{y^2-x^2}{x^3-3x^2y+3xy^2-y^3}\)=\(\frac{-\left(x^2-y^2\right)}{\left(x-y\right)^3}\)= \(\frac{-\left(x-y\right)\left(x+y\right)}{\left(x+y\right)^3}\)= \(\frac{-x-y}{\left(x-y\right)2}\)
\(\frac{y^2-x^2}{x^3-3x^2y+3xy^2-y^3}=\frac{\left(y-x\right)\left(y+x\right)}{\left(x-y\right)^3}=\frac{-\left(x-y\right)\left(y+x\right)}{\left(x-y\right)^3}=\frac{-\left(y+x\right)}{\left(x-y\right)^2}\)