Question

❤Всего 2 примера, даю 50 баллов❤
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Answer 1

Ответ:

11.

$frac{y-4}{y-2} *frac{y^{2}+4y+16 }{y^{3}-64} =frac{y-4}{y-2} *frac{y^{2}+4y+16 }{(y-4)(y^{2}+4y+16) }=frac{1}{y-2}$

12.

$frac{3y(2y^{2}-3x^{2}) }{6y(x^{2}+y^{2} }*frac{y^{2}(y-x)+x^{2}(y-x) }{y(y-x)}=frac{3y(2y^{2}-3x^{2}) }{6y(x^{2}+y^{2} }*frac{(y^{2}+x^{2}) (y-x)}{y(y-x)}=frac{2y^{2} -3x^{2}}{2y}$