四阶行列式中含a11的项有多少个？ 写出四阶行列式中含有因子a11a23的项
\u56db\u9636\u884c\u5217\u5f0f\u4e2d\u542b\u6709\u56e0\u5b50a11a23\u7684\u9879\u6709\u54ea\u4e9b\uff1f\u56db\u9636\u884c\u5217\u5f0f\u4e2d\u542b\u6709\u56e0\u5b50a11a23\u7684\u4e00\u822c\u9879\u4e3a:
(-1)^t(13st) a11a23a3sa4t
\u5176\u4e2ds,t\u5206\u522b\u53d6\u503c2,4
\u6240\u4ee5\u6709 (-1)^t(1324) a11a23a32a44 , (-1)^t(1342) a11a23a34a42
\u5373 - a11a23a32a44 , a11a23a34a42
其中，含有【一个】指定元素的项有 3！=6 项；
含有【两个】指定元素的项有 2!=2 项；
含有【三个】指定元素的项只有1！=1 项 。（第四个元素自然决定）
所以，四阶行列式中含a11的项有 6 个。
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