z^4=1*e^iπz=1*[cos((π+2kπ)/4)+isin((π+2kπ)/4)] (k=0,1,2,3)z一共有四个值一般情况下w^n=z在复数范围内的解为：z=r(cosθ+isinθ) (其中r为z的模,θ为z的辐角)w=r^(1/n)*[cos((θ+2kπ)/n）+isin（(θ+2kπ)/...