题目：

题解：

class Solution:
    def complexNumberMultiply(self, num1: str, num2: str) -> str:
        real1, imag1 = map(int, num1[:-1].split('+'))
        real2, imag2 = map(int, num2[:-1].split('+'))
        return f'{real1 * real2 - imag1 * imag2}+{real1 * imag2 + imag1 * real2}i'