③用来计算J(x)含的积分: eg1: oxO(xdx rox'xJo(xdx=Jox[3,(x)dx xJ1(x)o-o J,(xdx =a(a)-26x21(x)x aJ(a)-2ra d x2/2(x)x =a3J(a)-2a2J2(a)③用来计算 含的积分： [ ] 3 0 0 (1) 2 2 0 0 0 1 3 2 1 0 1 0 3 2 1 1 0 (1) 3 2 1 2 0 3 2 1 2 ( ) ( ) ( ) ( ) - ( ) ( ) - 2 ( ) ( )-2 1 ( ) ( ) - 2 ( : ) a a a a a a a x J x dx d x xJ x dx x xJ x dx dx x J x xJ x dx a J a x J x dx d a J a x J x dx dx a J a a e a g J ò = = ò ò = ò = ò = é ù ò ë û = J x( ) n