Odpowiedź:
[tex]13a) \: - 3x \times \frac{1}{3} x = - {x}^{2} \\ b) \: - x \times ( - 2x) = 2 {x}^{2} \\ c) \: \frac{1}{2} y \times 3t \times 2y = 3t {y}^{2} \\ d) \: - xy \times ( - xy) = {x}^{2} {y}^{2} [/tex]
[tex]14a) \: \frac{2x \times ( - 3y)}{ - 2} = 3xy \\ b) \: \frac{6p \times 2q}{4} = 3pq \: \\ c) \: \frac{0.5ab \times ( - a)}{ \frac{1}{4} } = - \frac{1}{2} {a}^{2} b \times 4 = - 2 {a}^{2} b \\ d) \: \frac{2y \times 3ty \times 0.6t}{0.1} = 6t {y}^{2} \times \frac{6}{10} t \times 10 = 36 {t}^{2} {y}^{2} [/tex]
