Question

УПРАЖНЕНИЕ 4.2 СРОЧНО ПОЖАЛУЙСТА

Answer 1

$\sqrt{49a^2}=7\, |a|\\\\\\a<0\ ,\ \ \sqrt{75a^2}=\sqrt{25\cdot 3a^2}=5\, |a|\cdot \sqrt{3}=-5a\sqrt3\\\\\\y<0\ ,\ \ \sqrt{1,21\, y^2}=\sqrt{1,1^2\cdot y^2}=1,1\cdot |y|=-1,1\, y\\\\\\c<0\ ,\ \ -2\cdot \sqrt{\dfrac{c^2}{1,44}}+2\, |c|=-2\cdot \dfrac{\sqrt{c^2}}{\sqrt{1,2^2}}+2\cdot (-c)=-2\cdot \dfrac{|c|}{1,2}-2\, c=\\\\\\=-\dfrac{-c}{0,6}-2\, c=\dfrac{10\, c}{6} -2\, c=\dfrac{5\, c}{3}-2\, c=\dfrac{5c-6c}{3}=-\dfrac{c}{3}$