P点表示的复数满足条件z=x+yi（x,y为实数,且|z|^2=x^2+y^2>1,x>0,y>0）
z的倒数1/z＝1/(x+yi)=(x-yi)/(x^2+y^2)=x/(x^2+y^2)-y/(x^2+y^2)*i
实部x/(x^2+y^2)>0,虚部－y/(x^2+y^2)
If a complex number z is represented by the point P as shown
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