1、 1 9 ( ) 1,2 4,5 y=x+(a0) 10 3,8,9,11 6,7,9,12,13,14 ( :30 ) 1. , , , . h t , ( A ) (A)1 (B)2 (C)3 (D)4 : , h t , , , , ; , ; , , . 2. 20 cm, 5 cm, h(cm) t( ) ( B ) : h=20-5t(0 t 4), B. 3. , , , , ( C ) (A)5 (B)4 (C)3 (D)2 : x = , x=3. 4.(2014 ) , . , p t( : ) p=at 2 +bt+c(a,b,c ), . , ( B ) 2 (A)3.
2、50 (B)3.75 (C)4.00 (D)4.25 : , p=at 2 +bt+c (3,0.7),(4,0.8),(5,0.5), , p=-0.2t 2 +1.5t-2=-0.2(t-3.75) 2 +0.812 5, t=3.75 , p . 5. , 300 m 2 ( ), x( :m) ( C ) (A)15,20 (B)12,25 (C)10,30 (D)20,30 : , A AG BC G, DE F, = , = = , = , = ,AF=x,FG=40-x, S=x(40-x) 300, 10 x 30. C. 6. , , , P a m(020 , 6 260
3、. y , y( ) x( ) , , .( = - ). : x 20 ,y=(33x-x 2 )-x-100=-x 2 +32x-100; x20 ,y=260-100-x=160-x, y= x N * . 020 ,160-x0 a 1) . , p 80 . (1) p=f(t) ; (2) ? . :(1)t (0,14 , p=f(t)=c(t-12) 2 +82(c0). , . : . : L= - + = - - 2 (x0). - =0, x=4 ,L 21.5. 4 , . :4 2. , 0.3 mg/mL, , 25% , , : 0.09 mg/mL, , .( 1 ) : . : x . 0.3(1-25%) x 0.09, 0.75 x 0.3,x log0.750.3 5. 8 :5
