Question

._ .чё как ???????._...........…

Answer 1

$\displaystyle\bf\\-0,2\sqrt{7,84} -\frac{1}{3} \sqrt{10,89} =-0,2\sqrt{\frac{784}{100} }-\frac{1}{3} \sqrt{\frac{1089}{100} } =\\\\\\=-0,2\sqrt{\Big(\frac{28}{10} \Big)^{2} } -\frac{1}{3} \sqrt{\Big(\frac{33}{10} \Big)^{2} } =-0,2\cdot\frac{28}{10} -\frac{1}{3} \cdot\frac{33}{10} \\\\\\=-0,2\cdot2,8-1,1=-0,56-1,1=-1,66$