Упростите выражение \(\frac {1}{2} x^2y^3x+\frac {1}{3}yyxxyx+\frac {1}{6}y^2x^2yx\) .
\(x^3y^3\)
\(x^9y^9\)
\(\frac {3}{11} x^3y^3\)
\(\frac {3}{11} x^9y^9\)