Question

ПОМОГИТЕ ПОЖАЛУЙСТА. ДАЮ 20б

Answer 1

$1)\frac{56x^{3}y^{4}}{z^{5}}*(-\frac{x^{2}z^{4}}{16y^{6}})=-\frac{7x^{5}}{2y^{2}z}\\\\Otvet:\boxed{-\frac{7x^{5}}{2y^{2}z}}\\\\2)\frac{72a^{7}b^{16}}{c^{10}}:(24a^{3}b^{16}c^{8})=\frac{72a^{7}b^{16}}{c^{10}}*\frac{1}{24a^{3}b^{16}c^{8}}=\frac{3a^{4}}{c^{18}}\\\\Otvet:\boxed {\frac{3a^{4}}{c^{18}}}\\\\3)\frac{3b-3c}{c}*\frac{4c^{2} }{b^{2}-c^{2}}=\frac{3(b-c)}{c}*\frac{4c^{2}}{(b-c)(b+c)}=\frac{12c}{b+c}\\\\Otvet:\boxed {\frac{12c}{b+c}}$