(x+ma=门B(2x+p)-Bp+d Bx+c n x+ pr+ B 2(1-n)(x2+px+q)”1 Bp-2c 2JI(x+212+(q-") 2021/2/202021/2/20 6   + + + − + = + + + dx x px q B x p B p C dx x px q B x C n n ( ) (2 ) ( ) (4) 2 2 1 2 1 2 2 1 ( ) 1 2(1 ) − − + + = n n x px q B  + + − − − p p n x q Bp C dx 2 [( ) ( )] 2 4 2 2 2