4-4M、Q、q之间的微分关系 y glx M) M(x)+dM X O(x)+do L O(x)+do=O(x)=(x)dx ax M(x)+dM=M(x)+@(x)dx+q(x)dn do(x) dM(x) g(x)l d M(x) do(x) ax d d 作业:4-1(a),4-2(c,e,h,D)4-4 M、Q、q 之间的微分关系 x y x dx dx q(x) M(x) Q(x) M(x)+dM Q(x)+dQ Q(x) + dQ = Q(x) − q(x)dx ( ) d d ( ) q x x Q x = − 2 d ( ) d ( ) ( )d ( )d x M x + M = M x + Q x x + q x x ( ) d d ( ) Q x x M x = ( ) d d ( ) d d ( ) 2 2 q x x Q x x M x = = − 作业:4 -1(a),4 -2(c, e, h, l )