Question

Преобразуйте выражение

 

(2√2+3√3)(2√2-3√3)=

 

(5√7-13)(5√7+13)=

 

Answer 1

(2√2+3√3)(2√2-3√3)= (2√2)2+ 3√3*2√2- 3√3*2√2-(3√3)2=8-27=-19

(5√7-13)(5√7+13)= (5√7)2-132=25*7-169=6

Answer 2

$(2sqrt{2}+3sqrt{3})(2sqrt{2}-3sqrt{3})=(2sqrt{2})^{2}-(3sqrt{3})^{2}=4*2-9*3=$$=8-27=-19$

 

$(5sqrt{7}-13)(5sqrt{7}+13)=(5sqrt{7})^{2}-13^{2}=25*7-169=175-169=6$