NGN HNG THI TRC NGHIM CHUYấN M-LễGARIT (M 01 99 CU) ) Cõu : Snghimcaphngtrỡnh( A B Cõu : x ( Nghimcaphngtrỡnh + ) + (3 - ) x = 0 l: C D = x l: A x=1hocx=-1 B ỏpỏnkhỏc C x=2hocx=-3 D x=0hocx=-1 Cõu : Snghimcaphngtrỡnhln3 x3ln2 x4lnx+12=0l A B C D Cõu : Snghimcaphngtrỡnh log (9 x - 4) = x log + log l A B C ỏpskhỏc D Cõu : Phngtrỡnhsaucúbaonhiờunghimthcphõnbit: 1 log ( + 3) + log ( 1) = log (4 ) B C D A Cõu : Phngtrỡnh: log (log2 x) + log (log x ) = cúnghiml A X=8 B X=16 C X=4 D X=2 Cõu : Snghimcaphngtrỡnh 22+ x - 2- x = 15 l A B Cõu : Rỳtgnbiuthc = log ( A Cõu : Phngtrỡnh x A -x ( A -1 x ) ( -1 + Cõu 12 : Giibtphngtrỡnh:log Cõu 13 : log C C. -2 ) D B D -1 x C (2 ) + B < + - 2 = cútớchcỏcnghiml: Cõu 11 : Snghimcaphngtrỡnh: 2 3< + log B l: A D - 22 + x - x = cútngcỏcnghimbng: B Cõu 10 : Phngtrỡnh A ) log log B C ( D + 1) = C D + + log > log ( + 3) > C > 10 D > log ( x + 1) - log ( x - x + 1) - log x = A x>0 B x C D x -1 x Cõu 14 : Snghimcaphngtrỡnh 22 x2 -7 x +5 = l: A B C D C D Cõu 15 : Snghimcaphngtrỡnh 3x - 31- x = A B Vụnghim Cõu 16 : Bitrng = log , = log , = log 7.Tớnhtheo , , giỏtrcalog 14 B +2 C D + + Cõu 17 : Snghimcaphngtrỡnhlog25(5x)-log25(5x)-3=0l: A 63 +2 + + +2 + + A B C D Cõu 18 : Chnkhngnhsaitrongcỏckhngnhsau A log a = log b a = b C log a log b a b 3 B log3 x x D ln x x Cõu 19 : Phngtrỡnh 42 x - 2.4 x2 + x + x = cútớchcỏcnghimbng: A B C -1 D Cõu 20 : Phngtrỡnh x - 3.3x + = cúhainghim x1 , x2 ( x1 x2 ) GiỏtrA= x1 + x2 l A Cõu 21 : A Phngtrỡnh log B 3log log C D ỏpskhỏc -3 x - 2.4 x - 3.( ) x = B -1 C log D Cõu 22 : Phngtrỡnhsaucúbaonhiờunghimthcphõnbit: A log | 2| log | + 5| log = B C D Cõu 23 : Snghimcaphngtrỡnh log ( x - 6) = log ( x - 2) + A B C D Cõu 24 : Phngtrỡnh:4x-3.2x-4=0cúnghiml A X=1;4 B X=2 D Vụnghim C X=-1;4 Cõu 25 : Nghimcabtphngtrỡnh log2 ( x + 1) - log2 (5 - x ) - log2 ( x - 2) A 2