(a) Is the differential equation exact?

沒有 【段考】高二數學上學期 權限，請先開通．

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(b) Find the general solution?

2, Given that y1=ex is a  sohifiott of y''-y=  0 on [-oo,oo], use reduction of order to find a second solution y2,

【已刪除】3. 

【已刪除】4. Solve by using the Laplace Transform.

【已刪除】1. A gable frame is subjected to a wind loading，as shown in Fig. 1. Determine the reactions at its supports due to the loading. (25%)

【已刪除】2. The landing gear shown in Fig. 2 consists of the bent member ABCD and the two supports CE and CF, which are two force members. Points D, E, and F connect to the fuselage. Point A receives the loads from the wheel. The connection at D can resist forces in all directions but only a torsion about BCD axis. Neglect the weight of the landing gear，calculate the forces in members CE and CF，Nqe and Ncv . (25%)