... hˆe.b˘a`ng nhau(a1 ,b1) =(a2,b2) ⇐⇒a1= a2 ,b1= b2.(II) Ph´ep cˆo.ng1.1. D-i.nh ngh˜ıa sˆo´ph´u.c 7(a1 ,b1) +(a2,b2)def=(a1+ a2 ,b1+ b2).1(III) Ph´ep nhˆan(a1 ,b1) (a2,b2)def=(a1a2− b1b2,a1b2+ a 2b1) .Tˆa.pho..psˆo´ph´u.cdu.o..ck´yhiˆe.ul`aC. ... sau.Gia’su.’z1= a1+ ib1, z2= a2+ ib2. Khi d´o(I) Ph´ep cˆo.ng: z1± z2=(a1± a2)+i (b1 b2).(II) Ph´ep nhˆan: z1z2=(a1a2− b1b2)+i(a1b2+ a 2b1) .(III) Ph´ep chia:z2z1=a1a2+ b1b2a21+ b21+ ia1b2− a2b1a21+ b21·C´AC ... ................ 263L`o.i n´oi dˆa`uGi´ao tr`ınh B`ai tˆa.p to´an cao cˆa´p n`ay du.o..c biˆen soa.n theo Chu.o.ngtr`ınh To´an cao cˆa´p cho sinh viˆen c´ac ng`anh Khoa ho.cTu..nhiˆen cu’aDa.iho.c...