Question

Памагите плииз быстро

Answer 1

Объяснение:

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Answer 2

$1)(\frac{x^{2} }{y^{3}}+\frac{x}{y^{2}}):(\frac{y^{2} }{x^{2}}+\frac{y}{x})=\frac{x^{2}+xy}{y^{3} } :\frac{y^{2}+xy}{x^{2}}=\frac{x(x+y)}{y^{3}} *\frac{x^{2}}{y(y+x)}=\frac{x^{3}}{y^{4}}\\\\2)\frac{a^{3}-9a }{a+7}*\frac{4a+28}{a^{2}-6a+9}=\frac{a(a-3)(a+3)}{a+7}*\frac{4(a+7)}{(a-3)^{2}}=\frac{4a(+3)}{a-3}$