第一章复数和复变函数 第3页 共轭复数的乘积为实数 (a+ib(a-ib) ★复数减法复数加法的逆运算 a +ib)-(c+id)=(a-c)+i(b-d), ★复数除法复数乘法的逆运算 a+ib (a+ib)(c-id) ac+ bd. bc c+id (c+id)(c-id) c2+d2✐❥❦ ￾✁❧￾♠♥✁ ✟ 3 ✠ ❣❤✽✩❀ ✶♦✿ ★✩❋ (a + i b)(a − i b) = a 2 + b 2 . F ✚✛♣q ✽✩✴✵❀r✯✰✳ (a + i b) − (c + i d) = (a − c) + i (b − d), F ✚✛sq ✽✩✶✵❀r✯✰✳ a + i b c + i d = (a + i b)(c − i d) (c + i d)(c − i d) = ac + bd c 2 + d 2 + i bc − ad c 2 + d 2