题目

Spilling coffee is never fun, but for German designer Stefan Kuhnigk is turned out to be a blessing in disguise(因祸得福）. He turned that first coffee stain into a small monster and has been creating Coffee Monsters ever since.Stefan recalls looking at the stain his cup of dark espresso(a type of coffee of Italian origin) left on a piece of paper and it looking back at him as if saying “Draw me,draw me, draw meee!”So he did just that, and created his very first Coffee Monster. The next day, he thought back to this little accident that he had challenged him to get creative, and decide已知z=1+2i，则z3= ．