奇数4个,偶数5个,奇数是19,21,23,25偶数是30,28,26,24,22 解:奇数项通项公式2n+17,偶数项通项公式32-2n若奇数项多余偶数项,则设偶数项为x项,则,49x+[2(x+1)+17]=218,解得x=199/51,舍去若偶数项多余奇数项,则设奇数项为x项,则,49x+[32-2(x+1)]=218,解得x=4,所以奇数项4项,偶数项5项,并且奇数是19,21,23,25偶数是30,28,26,24,22