Question

номер 9.2 только 2 и 4 пример,срочно очень надо,даю 20 баллов!!

Answer 1

$2) \: = {x}^{7} {y}^{21} \times {x}^{18} {y}^{12} \div {x}^{24} {y}^{32} = \\ \\ = {x}^{25} {y}^{33} \div {x}^{24} {y}^{32} = xy$

$4) \: {x}^{5} {y}^{8} \times {(xy)}^{5} \div {( {x}^{5} {y}^{3} ) }^{2} = \\ \\ = {x}^{5} {y}^{8} \times {x}^{5} {y}^{5} \div {x}^{10} {y}^{6} = \\ \\ = {x}^{10} {y}^{13} \div {x}^{10} {y}^{6} = {y}^{7}$