Question

Помогите пжпжпжпжпжпж​

Answer 1

$displaystylett frac{6}{1-sqrt{7}} -frac{2}{sqrt{7}+3}=frac{6(1+sqrt{7})}{(1-sqrt{7})(1+sqrt{7})} -frac{2(sqrt{7}-3)}{(sqrt{7}+3)(sqrt{7}-3)}=\\\=frac{6(1+sqrt{7})}{1-7} -frac{2(sqrt{7}-3)}{7-9}=frac{6(1+sqrt{7})}{-6} -frac{2(sqrt{7}-3)}{-2}=\\\=-(1+sqrt{7})+sqrt{7}-3=-1-sqrt{7}+sqrt{7}-3=-4$