... IM KKHOSTCHTLNGTHIIHCư CAONGNMHC2014 2015 Mụn:ToỏnKhi:A+B (ỏpỏnthang im:gm04trang) Cõu ỏpỏn iờm ồ2,0 a)Khosỏtsbinthiờnvvth cahms: y = x - x +2 a) TX. D = Ă b) Sbinthiờn. , +Chiubinthiờn.: y = x ... ữ = +Ơ x ứ ữ = -Ơ x ứ Bngbinthiờn. x y , y -Ơ + 0 - +Ơ 0,25 + +Ơ -Ơ - c)th.(Tv) Giaoimcathvitrc Ox l (1 ) , + , - ( )( ) Giaoimcathvitrc Oy l ( 2) Vth. Nhnxột:thnhngiaoimcahaitimcn I(10)lmtõmixng ... B - = >0 sau hai im A,B nmvhaiphớangthng d : y = x -2 Doú MA +MB nhnht im A, B,Mthnghng M lgiaoimgia d v AB Phngtrỡnhngthng AB y = -2 x +2:.Taim M lnghimhphng 0,25 1,0 0,25 0,25 0,50 ỡ ù x=...