Xộthm f (t ) = log2 t +t trờn ( 0 +Ơ)ỡa + b + c= 10ùa + b = cỡa= 2ùùù ớb= 3ớa+10Dubngxyrakhivch khiù 3 = 4ùc= 5ợùùợb + c = 8ỡ a= 2ùVy min P =58,tckhi ớb= 3ùc = 5ợrngthng d iquaim M ( 0 -
11) vcúvộct chphng u = (1 2 0).rGi n = ( a b c ) ( a 2 + b 2 + c 2 ạ 0) lvộct phỏptuyn ca(P).r rDo ( P)cha[r]