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撰写人：___________日 期：___________?
?111??123??111?
精品范文模板 可修改删除
免责声明：图文来源于网络搜集，版权归原作者所以
若侵犯了您的合法权益，请作者与本上传人联系，我们将及时更正删除。
解 3AB?2A?3?11?1???1?24??2?11?1? ?1?11??051??1?11???????
?058??111???21322?
?3?0?56??2?11?1????2?1720?? ?290??1?11??429?2???????
?111??123??058?
ATB??11?1???1?24???0?56?? ?1?11??051??290???????
4? 计算以下乘积?
?431??7?
(1)?1?23??2???570??1?????
?431??7??4?7?3?2?1?1??35? 解 ?1?23??2???1?7?(?2)?2?3?1???6?? ?570??1??5?7?7?2?0?1??49?????????
?3?
(2)(123)?2???1???
?3?
解 (123)?2??(1?3?2?2?3?1)?(10)??1???
?2?
(3)?1?(?12)? ?3???
?2?(?1)2?2???24??2?
解 ?1?(?12)??1?(?1)1?2????12?? ?3??3?(?1)3?2???36???????
?131??0?12?2140?? (4)???1?31? ? 1?134?????40?2?
?131??0?12??6?78?2140?? 解 ???1?31???20?5?6?? 1?134???????40?2?
?a11a12a13??x1??? (5)(x1x2x3)a12a22a23?x2?? ????aaa?132333??x3?
解
?a11a12a13??x1??? (x1x2x3)a12a22a23?x2? ????aaa?132333??x3?
?x1?
?(a11x1?a12x2?a13x3 a12x1?a22x2?a23x3 a13x1?a23x2?a33x3)?x2? ?x??3?
5? 设A??22?a11x12?a22x2?a33x3?2a12x1x2?2a13x1x3?2a23x2x3? ?1
?12?? B??1?13???0?? 征询? 2??
(1)AB?BA吗?
解 AB?BA?
由于AB???3
?44?? BA??1?36???2?? 因此AB?BA? 8??
(2)(A?B)2?A2?2AB?B2吗?
解 (A?B)2?A2?2AB?B2?
由于A?B??
?2?22?? 5??2??2?25???2(A?B)2???2?
但2???81