\ EE THI xHAo sal cuAT LUONG -LAN tvl0iv roAx 1r- KHoI'AB,A Thdi gian: 180 philt (kh6ng *A mdi giun g'iao di) / _\ I . JT I xe l0;- l. \ 4i 4J;i- 5 - x (" - 3)' 2. Ciu '(2 t2 HOt (Cdn bQ coi thi kh6ng gidi thfch gi th\m) H9 vd t€n thi sinh:. . .SO Uao danh. . . . . .L6p. TRTIOI{G THPT I,fi XOAY NArvr Hgc 2011 - 2012 EA chfnh thri.c Ciu I. Cho phucrng trinh sin2 x - sin 2x * (2nt+ 2)cos2 x = -6 l. Giai phucrng trinh voi m =2 . 2. Tlm m d6 phucrng trinh co nghi€m Cflu II. l. GiAi b6t phuong 111n6 r > x - 4 . (t + v/l* ')' 2. Tinh gi6i han sau lirn Cfiu III. 1. Hai ban hoc sinh di choi h6i xudn. Trong lO h6i co tro choi "Cdp d6i hodn h6o,,. Tro choi nhu sau: c6 100 the tre duoc d6nh s6 tu 00 d€n 99. rni cncri *ai ngrrdi duiTc rft mdt th6. I{ai ban sE ld cap ddi hodn hao nOu khi ghep hai th6 tre"lai ta d,ioc cap s6 ddi xtmg. vi du nhu 1 22l,bl:0, 71r7, Em nay inh ;t" -;at d6 hai ban hoc sinh c6 co h6i la "C6p d6i hodn hAo',. 2. Tinh hC s6 cira x,o', trong khai tri6n cira bi6u thirc P(r) = (r+l)'o't + x(x * l)tn" + rt (r*1)t"'u + +xr,,,, Ciu IV. Cho tir diln ABCD. Gqi M, IV theo thfr tq ld trung di6m AB vit CD, I ld trr.rng di6m MIV, G li trong t6m tam gil,c BCD. 1. Cho AC : BD - 2e, MN: o.16 . Tinh g6c gifr,a AC vd BD. Chirng minh ring ba di6m A, I, Gthing hdng. Tinh ti s6 IG v' Tron h0 trr-rc toa d6 oxy cho hinh cht nhdt ABCD c6 dien tich bang i2 vd tarn r\ . ;; J. eiet trung di€m M crta BC lirgiao di€m cua hai auong th;; L) d" "-Y : -J va d"' 2x + 3Y = 6. Tim toa d6 c6c dinh cua hinh chii nh4t. Ciu VI. Cho ba s6 thuc dr"rong a, b, c thoa rn6n -=-!_r* ,, bt _ * = c = r Tim gi6trir6nnhatcuabi6uthric T =a*b+c. cr' +ab+b' b' +bc'+c' c' +cct+ot -'' . 4i 4J;i- 5 - x (" - 3)' 2. Ciu '(2 t2 HOt (Cdn bQ coi thi kh6ng gidi thfch gi thm) H9 vd t€n thi sinh:. . .SO Uao danh. . . . . .L6p. TRTIOI{G THPT I,fi XOAY NArvr. EE THI xHAo sal cuAT LUONG -LAN tvl0iv roAx 1r- KHoI'AB,A Thdi gian: 180 philt (kh6ng. "C6p d6i hodn hAo',. 2. Tinh hC s6 cira x,o', trong khai tri6n cira bi6u thirc P(r) = (r+l)'o't + x(x * l)tn" + rt (r*1)t"'u + +xr,,,, Ciu