Question

Calculati a+b si b-a in fiecare din cazurile: explicati! cum ati facut!
b) a= 7√7-4√6  , b= √7 +3√2
c) a=2√11 + 3 ,  b= 7- 5√11
d) a= 2√3 -3 ,  b =-5 - 3√3

Answer 1

b) a+b=7√7-4√6+√7+3√2=(7+1)√7-4√2*√3+3√2=8√7+(3-4√3)√2

b-a=√7+3√2-7√7+4√6=-6√7+3√2+4√2√3=-6√7+(3+4√3)√2
c)a+b=2√11+3+7-5√11= (2-5)√11+10=10-3√11

b-a=7-5√11-2√11-3=4-7√11

d)a+b=2√3-3+(-5-3√3)=2√3-3-5-3√3=(2-3)√3-8=-1√3-8

b-a=-5-√3-2√3+3=-2-3√3