四、C(p)=700-10pgC(p)=-10 R(p)=100p-2p2:R(p)=100-4p L(p)-110p-2p2-700L(p)-110-4p-0,p-27.5 Q=45L(27.5)=812.5 「1121 [1111 2 1 五、A= 3 6 3 X=A-B= -2 333 3 10 六、2 (3G+92+9 令x3=C,x4=C2 6(7+5c2+5) x4」四、 ( ) 700 10 ; ( ) 10 ' C p = − p C p = − R( p) 100p 2p ; R ( p) 100 4p 2 ' = − = − ( ) 110 2 700; ( ) 110 4 0, 27.5 2 ' L p = p − p − L p = − p = p = Q = 45; L(27.5) = 812.5 五、                 − = − − 3 1 3 1 3 1 3 1 6 1 3 1 3 2 6 1 3 1 1 A ；                 = = − − − 1 0 3 2 0 2 1 6 1 1 2 1 6 11 1 X A B 六、a=2 令 3 1 4 2 x = c , x = c                 + + + + =             2 1 1 2 1 2 4 3 2 1 (7 5 5) 16 1 (3 9 9) 16 1 c c c c c c x x x x 七、 5 6 , 5 3 a = b = 25 18 , (1 3 ) 25 2 , 25 2 11 E = D = D −  =