Mathematics
Senior High
Resolved
想問這題怎麼算～
特色
1. 已知數列a,92,93,...,420的每一項都是-1oror1,且aı+a2+a3+...+a20=3,a12+
個?(非選擇題,需過程,5分)
+a20²=9,則有幾
目前
期
2. A是以原點逆時旋轉 旋轉矩陣,B是以y=mx做鏡射之鏡射矩陣,C是伸縮矩陣,I是乘法單位矩陣
(1)下列選項哪些正確?(多選題,全對5分,錯1選項3分,錯2選項1分)
(A)AB=BA (B)B的反方陣等於B(C)存在正整數n使得A"=I (D)C-AC=A (E) A100B100=B100 A100
(2)E=13231
24],C是伸縮矩陣,EC為以y=mx 做鏡射之鏡射矩陣,求矩陣C及m
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