11121aman=am+n(m,n2amn=amn(m,n3abn=anbn(n4aman=am-n(m,n,a0)21a0=1a0;2p1p23451a+b(a-b)=a2-b221(0)ppaaa222222()2,()2,abaabbabaabb312ABCDEFABCDEF15ABCDEF35ABCDEF36ABCDEFEA21B3465D78CF123123123412n10a1|a|10n120;110001P=/211P=120P=03A0P(A)13nAmAPA=m/n5SSSSASASAAASHLRt12ABCABCABC3123411802566(1)(2)71231238=21172ABCDEFABCDEF341SSS2ASA3AAS4SASHLHL112yxxy32123812312192123312121260312360