def multiply_strings(num1, num2): # 辅助函数:两个大数字符串的乘法 result = [0] * (len(num1) + len(num2)) for i in range(len(num1) - 1, -1, -1): carry = 0 for j in range(len(num2) - 1, -1, -1): temp = int(num1[i]) * int(num2[j]) + carry + result[i + j + 1] c...