complex number help needed

Need help in solving these complex numbers i tried hard but cant figure out the working. And anyone good in complex number give me tip&guideline in mastering this topic???

2. if Z = 5-i2, find the real and imaginary parts of:

d) (Z-1)/(Z-i)

3. Find real numbers x and y such that:

c) (1+i)x-(2-i3)y = 10 Ans: x = 6 ; y = -2

d) (2x-i3y) - (1 + i5)x = 3 + i2 Ans:x = 3 ; y = -17/3

7. Simplify the following and express the answer in polar form:

c) (2-i3)/(3+i2) - (3+i)/(4+i3) Ans:0.37<-28.8 degree

e) (2-i3)(3-i2)/i(1+i) Ans:9.17<225 degree

Thanks alot.......