Question

Помогите пожалуйста!!!!! Я вас прошу,очень при очень срочно!!!!!

Answer 1

$1)\\ (\sqrt{19}+\sqrt{2.7})*(\sqrt{19}-\sqrt{2.7})=(\sqrt{19})^{2}-(\sqrt{2.7})^{2}=19-2.7=16.3$

2)

$(5\sqrt{3})^{2}-(2\sqrt{2} )^{2}=(\sqrt{5^{2}*3})^{2}- (\sqrt{2^{2}*2})^{2}=(\sqrt{75)}^{2}-(\sqrt{8})^{2}=75-8=67$

3)

$((\sqrt{10} +1)+(3-\sqrt{10})) *((\sqrt{10} +1)-(3-\sqrt{10})) =\\ =4*(2\sqrt{10}-2)=8\sqrt{10}-8$

4)

$5^{2} -(\sqrt{8})^{2}+3^{2} +2*3*\sqrt{7} +(\sqrt{7})^{2} -6\sqrt{7} =\\ =25-8+9+7=33$