Прошу сократить
1) [tex] \frac{3x-y}{x-2y} [/tex] * [tex] \frac{2x+4y}{9x^2+6xy+y^2} [/tex]
2) [tex] \frac{x^2-y^2}{27x^3} [/tex] * [tex] \frac{18x^2}{xy-y^2} [/tex]
3) [tex] \frac{a-20}{a-8} [/tex] / [tex] \frac{a^2-400}{a^2-16a+64} [/tex]
4) [tex] \frac{xy}{xy+3y^2} [/tex] / [tex] \frac{x^2}{x^2+6xy+9y^2} [/tex]
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