Question

Решите задания на картинке

Answer 1

$\frac{42x^5}{y^4} *\frac{y^2}{14x^5} =\frac{3}{y^2} ; \\\frac{63a^3b}{c} : (18a^2b) =\\\frac{63a^3b}{c} * \frac{1}{18a^2b} =\frac{7a}{2} ; \\\frac{4a^2-1}{a^2-9} : \frac{6a+3}{a+3} =\frac{4a^2-1}{a^2-9} * \frac{a+3}{6a+3} = \frac{(2a-1)(2a+1)}{(a-3)(a+3)} * \frac{a+3}{3(2a+1)}=\frac{2a-1}{3(a-3)} ;\\\frac{p-q}{p} *( \frac{p}{p-q} +\frac{p}{q} )=\frac{(p-q)p}{p(p-q)} +\frac{(p-q)p}{pq} =1+\frac{p-q}{q} =\frac{q+p-q}{q} =\frac{p}{q} ;$