Z1*Z2 = a-a^2 * i + i + a =2a+(1-a^2)*i因为虚部是-2，所以1-a^2=-2, a=根号3w = 2a+(1-a^2)*i = 2*根号3-2*i
Z1*Z2 = a-a^2 * i + i + a=2a+(1-a^2)*i虚部为-2所以1-a^2=-2 a=根号3所以w= 2*根号3-2*i
