(1)简单的组合问题:C(9,4)*C(5,3)*C(2,2)=1260
(2)C(9,5)* C(4,2)*C(2,2)/A(2,2)=378
解析:后两堆本数一样,除以A(2,2)防止重复
(2)C(9,3)* C(6,3)*C(3,3)/A(3,3)=280
(1)简单的组合问题:C(9,4)*C(5,3)*C(2,2)=1260
(2)C(9,5)* C(4,2)*C(2,2)/A(2,2)=378
解析:后两堆本数一样,除以A(2,2)防止重复
(2)C(9,3)* C(6,3)*C(3,3)/A(3,3)=280