Răspuns:
2.
(2x-1)(3x-1)/5x(3x-1) = (6x^2 - 5x + 1)/(15x^2 - 5x)
3.
(4+rad5)^2 = 16 + 8rad5 + 5 = 21 + 8rad5
(4-rad5)^2 = 16 - 8rad5 + 5 = 21 - 8rad5
(21+8rad5-21+8rad5)/11 = 16rad5/11
4.
(3x-2)(3x+2)/(3x-2)^2 = (3x+2)/(3x-2)
5.
(b-3)^2/a(a^2 + 2) • (a^2 + 2)/(b-3) = (b-3)/a
