Question

50 баллов, 3 задания.

Answer 1

Решение на фотографии.

Answer 2

$\displaystyle\bf\\2) \ \ \sqrt[3]{15\frac{5}{8} }= \sqrt[3]{\frac{125}{8} } =\sqrt[3]{\Big(\frac{5}{2} \Big)^{3} } =\frac{5}{2} =2,5\\\\\\3) \ \ 17-(x+2)>12x-11\\\\17-x-2>12x-11\\\\-x-12x>-11-15\\\\-13x>-26\\\\x<2\\\\Otvet:x\in(-\infty \ ; \ 2)\\\\\\4) \ \ x^{4} -81=0\\\\x^{4} =81\\\\x_{1,2} =\pm \ \sqrt[4]{81} =\pm \ \sqrt[4]{3^{4} } =\pm \ 3\\\\Otvet:-3 \ ; \ 3$