Question

Calculati a+b si b-a in fiecare dintre cazurile:
a) a=3√7-5√2; b=5√7+2√6
b) a=7√7-4√6; b=-5-3√3
c) a=2√11+3; b=7-5√11
d) a=2√3-3; b)-5-3√3.
URGENT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer 1

a)
a+b=3rad7 - 5rad2 + 5rad7 + 2rad6 = 8rad7 - 5rad2 + 2rad6
b-a=5rad7 + 2rad6 - 3rad7 + 5rad2 = 5rad2 + 2rad7 + 2rad6

b)
a+b=7rad7 - 4rad6 - 5 - 3rad3
b-a=-5 - 3rad3 - 7rad7 + 4rad6

c)
a+b=2rad11 + 3 + 7 - 5rad11 = 10 - 3rad11
b-a=7 - 5rad11 - 2rad11 - 3 = 4 - 7rad11

d)
a+b=2rad3 - 3 - 5 - 3rad3 = -(rad3 + 8)
b-a=-5 - 3rad3 - 2rad3 + 3 = -(5rad3 + 2)