... =HK0?4D[;∈C4*^D=^;54G*^D=^;F,2^∈_I3@I348;QKQ,P\Q= (] < /b> Q^Bài 4 (4 < /b> điểm). &`axx’ ,Pyy’,1,)S b$ c`@d#^e^1&"K(P&Mfg&\@xx’$N\&`@d'K(P&Mg&\@yy’5#^ b5 &`@dP? ... +>?@8*A*⇔ B A⇒ B =? B ⇒∈CBDED:FGH2A B I3A84/J;GH2AEI3A 4( < /b> 0;GH2A:I3A B 4( < /b> 0;HK0?L12/I3 ( < /b> 3 8B ,3EBBài 2 (4 < /b> điểm). M'NAO @,P(PQ!@*O*ORA8R$%#@-!,P&M;N&S#@- () < /b> ;N&S#@-./;*O*ORA8R⇔NA8RG=G=GRA8RG=4O; 9< /b> 8RTK2UAVW/?@⇔AG?,3&X/28+GRA8R⇔A:⇔AYBHK0?WNA8R⇔4D;A 4B DGB;X04GBD B; ;*O*ORA8R⇔:4O;A8RO=4G;Z8R⇔:NZ8R⇔NZTK2UAVW/?@⇔A?,3&X/2AAY8HK0?NA⇔AAY8Bài ... +>?@8*A*⇔ B A⇒ B =? B ⇒∈CBDED:FGH2A B I3A84/J;GH2AEI3A 4( < /b> 0;GH2A:I3A B 4( < /b> 0;HK0?L12/I3 ( < /b> 3 8B ,3EBBài...