DAP.AN Vi6t phrtono uen dtdrn I(-Z;p) ddn ti*p tuy6n td, tdn nh6t Phrrong trinh ti6p tuy6n @ u:6iTz@-uo)*ffi Kho6ng c6ch tr) I d6n DOI* Currh, t On* *6 , tr T)m duoc hai ti6p tuy6n y: 9i6l x; y: *fi ddi ph,ro"S triol, tn e (7 - 0 B6t phrrong trinh tr6 thdnh DEt r : logzr b6t phuon* y'T;E;:rtosrn - < yEQos2r - s) (tr-zt-s>o I \t-3>o It2-zt-s< Gi6,i phxong trinh b(t-s1z : ( )2*+82+6)0 I"'- t>o 0; Vp < ft o Khi x o Vdi : r> -1 thi b6t phuong triuh th6a thi b6t phuong trinh thh,nh e1/I{aT + {i Ti.nh gid (1 zJ;A1 : _; 1;* ( loa, ) : NghiQm phuong trinh : x: - 1; Gi6i duoc : x KL : *1: td +a)1m: : biiiu thrtc x: :A:4C?oo+_8Cf*;6 +Clooa+Clsrxz + +Cltq.0-r00 (1 - r)rm : Cr* - Ci*r + C!**+ +Cffirroo Suy ra: (1 + z)100 + (1 r)100 : 2(Cf* + Cr2*r, +'"frffi Dao hd,m hai v6 ta duoc t0O[(t + r)ee - (t - z)9e] ,: Z(ZC?* r: + 4Cf*r;s + + 1ggCfffzee) Cho x - 1,ta drfgc,4 : l00.2ee Cloo : cho hinh chdp s.aBCD c6 sA = sB : gg to,rn gid,c cd,n oHinh vE : , fu) : lzao, BC :2a : ,d dd;y ABC rd T6nh thd ttch lchfi chap S.ABC o1/2, Tinh duoc AB : AC : ua'* UABC S^* ==W \/5 vh b6n kinh dtrdng trdn ( ABC ) ld Ha SHL(ABQSuy ru R: ,8.?.= : SH:!/SF=V4:a'i6 Do d6 Vs.epc : *Sorr.sr :@ffi T?.mI:lu n-z ,^ + !fili** DAt t ,at : \/iTI + n : tz,- tril :iat ,: I;.ztdt:2^!- Adt +:' I:2i(r,-zt+L : t + )dt 2(; - t2 + t - 2tnlt + 2l) + c }ry t : 'tlill t, aoq k6t;; Ttong m(.t phd,ng odi he * v2 : a v#t phuons tri,nh dudns '-:l^*^n^:' !l:)^' ';;:i A, qua n.:.')' A cdt 1c;,tc,i rnu, ad, :::: ,;;;":;:;::";":r\l;:, - (C)c6 tam O(o;o Phuong tr)nh drrdnr t OH,OK vuOng g6c vdi cria hai dudng trdn A c6 AH : AK - oHz : AI2 - IK2