Răspuns:
a=3✓5-2✓5-4✓3+2✓3
a=✓5-2✓3
b=7✓3-4✓3-2✓5+3✓5
b=3✓3+1✓5
c=5✓5-3✓3+5✓3-2✓5
c=3✓5+2✓3
a+b+c= ✓5-2✓3+3✓3+1✓5+3✓5+2✓3
a+b+c= 5✓5+5✓3
a-b+c= ✓5-2✓3-3✓3+1✓5+3✓5+2✓3
a-b+c= 5✓5+10✓3
