若f(z)=1-z的模,z1=2+3i,z2=2=i,则|f(z1+z2)|=

题目

若f(z)=1-z的模,z1=2+3i,z2=2=i,则|f(z1+z2)|=
同题,急求解题过程~~谢谢~~

答案

|f(z1+z2)|
=|f(2+3i+2+i)|
=|f(4+4i)|
=|(|1-4-4i|)|
=|(|-3-4i|)|
=|√(3²+4²)|
=5