充要条件的判断与证明

SILICO.VA(122000)][:G2:A:1871-7597(2008)0110055-02p9pz*qp99p()1:1.p9:pp;2.p9:pp;3.p4:pp()2:;;;()3:A=Ip(xB=19(X)l(1)Ac_Bp4(2)BcAp9.WA=Bp9A(B(4)ABBAp4():1.Pq_(1)p:q:(2)P:x702q:x1[5(3)AABCP:AB,q:ab(a,bA,B):(1).PqqP..pq(2):xa2(P)xx5(q)xn5(q)xn2(P)..p4(3)AB(P)e--ab(q)..pq::(1)(2)(3)():2CF(x,y)=0:PF(x,y)=0:PC:QF(x,y)=0:QG:::PCPF(x,y)=0PF(x,y)=0PC:...:A=BB,A,A4aBB-*,A():A={xIp(x)l,B{{xIq(x)}3.M={xlx3},N={xIxn51xEM:rI'XENxE(MN)_SILICONLLEY.a:*A={xI:MN}B={x6(MnN)}ABk:=4k24(k+2)0:MxeNxe(MnN):()4.AB?x1+x2=2k0x,x2=k+20kk2::AB;BAAB.AB;BAABAB;BAABAB;BAAB..5.2kx+(k+2)=0:[1]11:[21M::(1969-)(54)3.()::?:;;;()().::[1].2004,08.[2].2006,1.56