12. Выполните умножение $$ \frac{6 x^{3}}{x-5} \cdot \frac{25-x^{2}}{18 x^{2}} $$

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Calculate or simplify the expression $$ (6*x^3)/(x-5) * (25-x^2)/(18*x^2) $$.
Simplify the expression by following steps:
- step0: Solution:
  $$\frac{\frac{6x^{3}}{\left(x-5ight)}	imes \left(25-x^{2}ight)}{18x^{2}}$$
- step1: Remove the parentheses:
  $$\frac{\frac{6x^{3}}{x-5}	imes \left(25-x^{2}ight)}{18x^{2}}$$
- step2: Multiply the terms:
  $$\frac{-6x^{3}\left(5+xight)}{18x^{2}}$$
- step3: Rewrite the fraction:
  $$-\frac{6x^{3}\left(5+xight)}{18x^{2}}$$
- step4: Reduce the fraction:
  $$-\frac{x\left(5+xight)}{3}$$
- step5: Multiply the terms:
  $$-\frac{5x+x^{2}}{3}$$
Умножение $$ \frac{6 x^{3}}{x-5} \cdot \frac{25-x^{2}}{18 x^{2}} $$ дает $$ -\frac{5x+x^{2}}{3} $$.
Результат умножения $$ \frac{6 x^{3}}{x-5} \cdot \frac{25-x^{2}}{18 x^{2}} $$ равен $$ -\frac{5x+x^{2}}{3} $$.

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