Question

Дробь к знаменателю надо привести
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Answer 1

$\frac{x}{5y} * \frac{7y^{2}*z^{2} }{7y^{2}*z^{2}} = \frac{7y^{2}*z^{2} *x }{35y^{3}*z^{2}}$

$\frac{8}{x-1}*\frac{7}{7} = \frac{56}{7x-7}$

$\frac{3}{b-5} * \frac{b}{b} = \frac{3b}{b^{2}-5b}$

$\frac{x-2}{x+6} * \frac{x-6}{x-6} = \frac{(x-2)*(x-6)}{(x+6)(x-6)} = \frac{x^{2} -8x+12}{x^{2} -36}$