公式:a + jb = √(a^2 + b^2)∠ arctg (b/a)Z1 = 3+j4 = 5∠53.13°Z2 = 8 - j6 = 10∠-36.87°I1 = 220∠0° / 5∠53.13° = 44∠-53.13°I2 = 220∠0° / 10∠-36.87° = 22∠36.87°