Răspuns :
=(4-4√3+3)*(4+4√3*3)=
=(7-4√3)(7+4√3)=
=7^2-(4√3)^2=
=49-48=
=1
(a+b)^2=a^2+2ab+b^2
(a-b)^2=a^2-2ab+b^2
(a+b)(a-b)=a^2-b^2
=(7-4√3)(7+4√3)=
=7^2-(4√3)^2=
=49-48=
=1
(a+b)^2=a^2+2ab+b^2
(a-b)^2=a^2-2ab+b^2
(a+b)(a-b)=a^2-b^2