Question

Ajutor la 2 si 3, va rog.

Answer 1

a)a=3√5+√2; b=2√5-√2
a+b=3√5+√2+2√5-√2=√5(3+2)=5√5
a-b=3√5+√2-2√5+√2=√5(3-2)+√2(1+1)=√5+2√2

b) a=4√3-2√6; b=7√6+√3
a+b=4√3-2√6+7√6+√3=√3(4+1)-√6(2-7)=5√3+5√6
a-b=4√3-2√6-7√6-√3=√3(4-1)-√6(2+7)=3√3-9√6

x+y+z∈N
a=4√2+3√3; b=3√3-√2; c= -6√3-3√2
a+b+c=4√2+3√3+3√3-√2 -6√3-3√2= √2(4-1-3)+√3(3+3-6)=√2*0+√3*0=0