1 ( ) 18 MA 2009 : : (4)
1o A. ()=()+() 10
B.
x 1 ,x 2 ,,x X (), f i x i , i=1,2,,. 5 , . . f, g (f ( x )g( x ) ) = f ( x )g( x ) + f ( x )g( x ) 2 . A , , A B = A B 2
.
1 4
2
. f(x)=x (x ) = x 2 . . 2 . . 2
2 x i , i=1,2,3,4 i , i=1,2,3,4. 2 x 2 =3 . =4. x xi 2 3 5 8 . 2 =7. i 6 ; 3 4 9
. 4,9. 9 . X . 4,9 2,2 7
2 4
3
3o f(x)=x36x2+x7, ,
2f ( x ) + f ( x ) + 15 = 3x 2 , x . =9 7 . lim
f ( x ) x 1 x 2 1
8
. f, y=3x 10 4 f(x)=lnx .
x + 2 6+2, x>0 2
. . f f . 6 . f . 6 . f(2), f(4), f(8), f(3) f(5) . . R , R=3+ ln
1 = ln4+ 2 6 4 7
3 4
4
. ={1,2,3,,100} . A , ={ | R+
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