Question

Выполните действия. 4.73 1)

Answer 1

1) ( V 1,3 + V 13 )( V 13 - V 1,3 ) = ( V 13 )^2 - ( V 1,3 )^2 = 13 - 1,3 = 11,7
2) ( 5 + V 2 )^2 = 25 + 10V2 + 2 = 27 + 10V2
3) 11,7 - 27 - 10V2 + 10V2 = - 15,3
Ответ ( - 15,3 )

Answer 2

C.4.73.
1) 
$(2+sqrt{7})(sqrt{7}-2)-(5+sqrt{2})^2+10sqrt{2}=\(sqrt{7})^2-2^2-(5^2+2*5sqrt{2}+(sqrt{2})^2)+10sqrt{2}=\7-4-(25+10sqrt{2}+2)+10sqrt{2}=3-25-10sqrt{2}-2+10sqrt{2}=-24$
2) 
$frac{2}{7}sqrt{5}*1frac{3}{4}sqrt{5}+(sqrt{25^0}-2)^2=frac{2}{7}*frac{7}{4}*(sqrt{5})^2+(sqrt{1}-2)^2=\frac{5}{2}+(-1)^2=2,5+1=3,5$
3) 
$frac{5}{3-2sqrt{2}}+frac{5}{3+2sqrt{2}}=frac{5(3+2sqrt{2})}{(3-2sqrt{2})(3+2sqrt{2})}+frac{5(3-2sqrt{2})}{(3+2sqrt{2})(3-2sqrt{2})}=\frac{5(3+2sqrt{2})+5(3-2sqrt{2})}{(3-2sqrt{2})(3+2sqrt{2})}=frac{5(3+2sqrt{2}+3-2sqrt{2})}{3^2-(2sqrt{2})^2}=frac{5*6}{9-8}=30$