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3`ÊËc
21 .e f g h Ì Í =Î Ï *m 3Ñ m .Ò ÓÔÕÖÑ0/ × Ø 1.
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â 6 ã ä å W Ú 0|}~. : .
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øùú·ûüQxyýþÿ.
25. [-2 , t] (t> - 2 )
f (x) = (X2 -3 X+3) ex (e ).
( 1 ) t > l y=f ( x )
( 2 ) m=f ( - 2) , n=f ( t ) , m<n
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9 . 2()3A
10 . 2()3C
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11 . 2()3B,D
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13 .2()3A,C,D
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16 .2()3
17 .2()3
18 . 2()3
19 .2()3
20 .2()3
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C D E F G H D I - 3 . K L M 4,
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g * C 1 Y G h j =
i | © = lm n o : .
pqr o s t u 4vwx,
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2]] m r c1Y
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22. 2()3 ( 1 ) * C1Y f (x) =log3 ( 3 -3 x ) ,
/. 3 -3 x > 0 ,R x V l,
f (X )¡( -8, 1)
( 2 ) * £¤ g (x) =loga (3 - ax) - Ioga (3+ax),
/ 3 - a x > 0 ,¥ 3+ax>0,
-¦:¨©ª«¬;®,
¯4k (x) =loga (3 - ax) - loga (3+ax) = h?°± ²
''g ( ' x ) = ¶ · = - k % f § = - g (X )'
.;.g ( x ) ¸
( 3 ) * ¹ u=3 - ax, ,\a>0, a*l,
u=3 - ax>2, 3?
º»,
¯.. f ( x ) >2, 3?º¼ OVaVl,
¯½f ( x ) >2, 3?¾¿1,
f (3) =1,
R f (3) =loga (3 - 3a) =1,
2., À.1
23. 2()3 A1B*
C XÁÂÃ G X Q ÄÃ G O d e l
ÅÆÇ4;0 ¼ !1 4]È » É Á
g * Ê Ë Ì - Í Î Ï ^ = * . . Ñ % x Ó Ô ÎÕÖ : .
C1Y¤ × ØÙI=Ú-Û |Á,ÜÝÞ'ß;.
C 0'áâ =ÖG ã = Ç c :1äåæ1çÇè¬é0 =ê ëìíÞ'ß;,
îïðñòóô=õÏe = ÷ ø ù ú a;H Q'ý
íÞ'þ;
C :1ä¤ Ç =X ÿ |Q
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F.
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Q R % S '( .TU V
W , = X = / : ; , Y Z > @ A [
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o:*p=q
r=st u = 1 w+ y] , y . I.
% } Q " , L ' u > “ = ’
>
= 2 = = M + O
# >W .1M Q .<R O © : ¡:¢1.
¦¨¦?’ I----- y ¥1 %[Fg r v
! £ ¤ ¥ § © « ¬ j ® ± = ´ F ¶ ·
¸ ,2 ¹ º » ¼ e½ ¬¾¿ÀÁF¬ÃF¤Ä?FÅQ Æ 8 Ç È9
É Ê 5 6 Ë Ì ÇF Í l F /b c Q M T M J Î 8 2 = ] _ 3 + Ð = Ñ Ò Ó
#Ô5 6 => : ; < Q ÕÖ Q º g × M 8H = 0
#Ô h Á Ú Û F Ü Ý F j È j # Ô Þ ß « 4
à á â } = - K @ â ´ u > F å 2 ·F eæ · · · Z Ã Á
. 2
È ç è = eDE Q Ú4 ê.Á : .
#Ô >F*È8ëì
24. íîïe > = ð 2 F e = 2 = ñ ò ó2 , F 1,
(1 ) R:
ô õ = ö - eÎ / / ÷ ø ù Å F Á
# Ô ú = × F ó
S R > = H = û#ÔÅü¥1 # Ô 1È ý 3
þÿ1 1 . :
==
| = - 1 = & T =
§: a F !:" # = $ = $ = 3 2 = % & H '(=Q
) * = + ^ = - (/ = 0 1234 5 6 7 )9
: * < = & :4 ? = @ A |+4 2 B C +E =F
) G H I 5 K L M 6 7 ) 9
(3 ) )W9X=YZ[V% % ] 0 ^ZTUV
W _ ` + a ( b Scd[V efZ[Vg h i j ).
k Q l = m n 3 , W G Qopqr
s t u F_ = t ( 0 v # x y zScd[V)
E -1
{ | = } + W ~ Q % = G = /
1: n = ‘ ' =g = W G 0 ..]
s = F{br = Q
sl ]o , {?Z[Vg 5
51lZ[VT 1 .
¡ ;£ .¤ ¥5¦§¨©T]o , ª«¬1<®¯°G
±~V² “ §´µ¶·¸l¹]= º 1l»V% T ¼ = Q
2 5 .½¾¿ ( 1 ) )3À] f' (x) = (x2 - 3x+3) *ex+ (2x - 3) *ex=x (x - 1) *ex .
t> l Q ? (x) > 0 , WG t> x > l ^ - 2<xV 0Q f (x) < 0 , WG 0V x < l,
f ( x ) « ( - 2, 0) , (1, t ) ÂÃÄ« (0, 1 ) ÂÃÅ.
(2) )3Æ¡3Q r (x) > 0 , WG x > i ^ x< oQ r (x) < 0 , WG o < x < i : .
f ( x ) « ( 28, 0) , (1, + 8 ) ÂÃÄ« (0, 1 ) ÂÃÅf (x )« x= lÉÊGË5Ìf (1)
=e.
Í ( -2 ) =13e” V e , f ( x ) Ϋx=
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