附录答案－微积分-英文版-威廉·布里格斯 -第二版

a. f ′ x = - b. y = - - 53. a. C, DР dx 3x + 1 2 2 2Р 1 1 22∆y b. A, B, E1 2c. A, B, E, D, C 55. a. Approximately 10 kW; Р is the limit of and is the rate of change of y with respect to x. 1 2Р ∆x approximately -5 kW b. t = 6 and t = 18 c. t = 12 РРРZ01_BRIG2327_02_SE_Ch03_ANS.indd 1196 27/06/14 8:57 PM Z01_BRIG2327_02_SE_Ch03_ANS.indd 1197 27/06/14 8:57 PM