Question

aduceti la forma cea mai simpla expresia 

Answer 1

a)√45+√61 1/4 - 11√ 1 1/4=
=3√5+√245/4 - 11√5/4=
=3√5+(7√5)/2 - (11√5)/2=
=3√5 - (4√5)/2=
=3√5 - 2√5=
=√5

b)[√(7+4√3)+√(7-4√3)]²=
=(7+4√3)+2√(7+4√3)(7-4√3)+(7-4√3)=
=7+4√3+2√(49-48)+7-4√3=
=14+2√1=
=14+2=16