Voi nota r2 --- radical din 2 (spre ex)
a)(5r5-3)-(7r2+2)+(8-2r2)-(r5-r2)= 5r5-3-7r2-2+8-2r2-r5+r2= 3+4r5+8r2 acesta e raspunsul final (daca se cere, poti sa calculezi la calculator)
b)(-6r3+5) -(2r2 -4) +(r3-r2) -(8r2+r3)= 5-6r3-2r2+4+r3-r2-8r2-r3=9-6r3 -11r2
c)(1+2rx^2)-(5-rx^2) +(-5rx^2) -(8+rx^2) =1+x-5+x-5x -8-x = -12-4x
