Question

Помогите срочно !!!!​

Answer 1

$\displaystyle\bf\\a)\\\\\frac{8x^{2} }{y^{2} }: 18y^{3} =\frac{8x^{2} }{y^{2} }\cdot\frac{1}{18y^{3} }=\boxed{\frac{4x^{2} }{9y^{5} } }\\\\\\b)\\\\1) \ \ -\frac{a}{5b} :\frac{a^{3} b}{15c} =-\frac{a}{5b} \cdot\frac{15c}{a^{3}b } =\boxed{-\frac{3c}{a^{2} b^{2} } }\\\\\\2)\\\\a^{2} -4b^{2} :\frac{2a+4b}{3} =(a+2b)(a-2b)\cdot\frac{3}{2\cdot(a+2b)}=\boxed{\frac{3a-6b}{2} }\\\\\\a\cdot b)\\\\1) \ \ \frac{4x}{y} \cdot\frac{y}{8x} =\boxed{\frac{1}{2} }\\\\\\2)$

$\displaystyle\bf\\\frac{28m^{5} }{23n^{4} } \cdot\frac{46n^{6} }{7m^{3} } =\frac{7m^{3}\cdot 4m^{2} \cdot 23n^{4} \cdot 2n^{2}}{23n^{4} \cdot7m^{3} } =\boxed{8m^{2} n^{2} }$