Question

Помогите решить 4,5 плиз

Answer 1

$\frac{a}{Sin \alpha }= \frac{b}{Sin \beta }\\\\ a= \frac{b*Sin \alpha }{Sin \beta }= \frac{24* \frac{1}{12} }{ \frac{1}{7} }=2*7=14\\\\\\( \sqrt{11} - \sqrt{5})( \sqrt{11} + \sqrt{5})=( \sqrt{11}) ^{2}-( \sqrt{5}) ^{2} =11-5=6$