計(jì)算下列排列的逆序數(shù). (1)1234; (2)4132; (3)3421; (4)2413; (5)523146879; (6)135...(2n-1)24...(2n); (7)135...(2n-1)(2n)(2n-2)...2.
計(jì)算方程組的系數(shù)行列式,并驗(yàn)證所給的數(shù)是方程組的解: