E:M:T ffitu wWffiru ffiWffi 6 &wW €ps# :=-!'-1* :.=;=.: =: S :=*==:==-€ *-:\.<+ '' "*u .f'' : a%%wpffi mem eHffimmmm q:a&mm ffiffiffi'ffim %6 ffirffimffi wffixpry ffimwpm"- '"4 P' ffi#ffiffiffi 'ffi'ffiffi:ffiffi ffiw wmmrtmmg6 tr&86$ ==l€}E :: ::+=i:: ::' :.=:: r:,=:*::l ;a ==::=.: ::= :1i, ::-= *:=::tiij:: :i:: : g+ =iE: i;ig: ::.:. E*i +. "' +:' .;.:-+ =-:.=i ES Lpre*' * r* \d .*r ?* r ffiffiffiffi -q$@p %*ffi, [...]... gi6o vien vh hoc sinh cdn luu f khi sil dung cudn SGK niy trong nam hoc sap tdi, d5c bi0t la nhfrng didm mdi vd kh6c so v6i chuong trinh vd SGK ldp Ir)I-Ii?:hJ mE-& 11 chinh li ho p nhdt nam 2000 (SGK2000) r vB NOr DLrNG cHUoNG So rRiNH v6i SGK2000, SGK Dai sd vd Gidi tich 11 ndng cao c6 nhfing didm kh6c bi6t sau ddy: 6ch 916o khoa (SGK) Dai sd vd Gidi ttch 11 ndng cao dugc biOn soan theo chuong -... Mslvl khi M di chuydn doc theo dd thi ddn ddn Ms" md trong ciic s6ch trudc dd kh6ng dd cflp gi|l6t mong nhAn duoc c6c f kidn xay dung cria c5c thdy gii{o, cO gi6o, cdc nhi khoa hoc vd ciacdc em hoc sinh dd SGK ngiy cdng Cdc tdc t6t hon T#IN - HOC GfudiUe s6 361 l7-20o7) 15 BAi T5i361 Giei he Phuong trinh nt Ffr ,tl //t( t-ll18 - r- r -T=; r/x tlY lz 5 /x+./y +'!z- 1 I I 118 x+y+z+-+-!-='xyz9 rr -111 1728... PHUoNG PHAP rdp cAN vA MOc o0 vBu cAu Chuong | (Hdm sd luong gidc vd phuong trinh luong gidc) ld phdn ndi tidp cira phdn luong gi6c l6p 10 Khi khdo sdt su bidn thi€n ctn cdc hdm sd luong gi6c, SGK Dar sd vd Gidi tich 11 ndng cao srl dung phuong ph6p truc quan, trlc li khio s6t su chuydn d6ng c[ra c6c didm dd suy ra su tang-giim cfia c6c him sd luong gi6c Phuong ph6p tinh tidn dd thi (dA hoc & l6p 10) cflng... (:.O 33 NhQn xdt sai lAm 0 0 1 Tir d6 d6n tdi k5t qun md kh6ng th6y sailitm=1frl J 2) Khi gap PT dpng auz +buv+cv2 giii chung li : =0, c6ch N6u v;r 0, chia ci hai vi5 cria PT cho ,', sau =! , tudugc mQt PT bdc hai dtii v6i r v (trudng hgp v : 0 dugc x6t ri6ng) 3) N6u PT c6 d4ng m : /(t), thi PT ndy c6 d6 d6t 7 nghiQm khi rn thuQc tip gi6 tri cria HSI(0... E(t) I Tac6g'{t)=-6t+2; g'(t): 0khi t=1 Lip hay m2 +82-8=0 e *l! Vx+l ^=-tJ*-!Vx+l Ddt t= +4x+4-m2 Hdm sd c6 cgc tri khi m *0 Gi6 su A vit B li c5c di6m cgc trf cira him (1) Ta c6 O) : (2-m ; -2), 1 ci hai v6 cta PT cho Jx + I > 0 , ta dugc t; _, (r) oz vu6ng tai O LOt gtot la vli duong Phuong trinh trdn tuong mJ x + I = -}J-v 1 + z1l7' t x> bang bi€n thi€n cta him g(r) ,11 thdy v6i 0 5(l) . K44, DH Md - Dia chiit' Cdm Phd, Qudng Ninh) t-ll18 ./x+./y +'!z- - r- r T=; r/x tlY lz 5 1 I I 118 x+y+z +-+ - !-= - 'xyz9 rr -1 11 1728 xvx+yiY+ziz - T=;' xVx. J;.1*{6-r IIIII :-+ 0 2X (J-*t-r r+V7-r) - ltlllt T- | x+o 2x 2x ) Jr*r-r l+t[J : lrm- r ll[1 r+0 2X ,-& gt;0 2X C6 f kidn cho rlng lim nhu trOn li sai vi Jr*r-r.t+Vx-t,,. =4b+a-3b=a+b<t f f (-t) = -4 b -( a -3 b) = -a - b al Suyra -l<a+b<l @) Hoin toin tudng tu ta c6 Ir(r) =!*( ,-3 b). | -o -b<l )"z) z' '2 2 lr(-r)