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3.
已知無窮級數112+122+132++1n2=62,求無窮級數1122+1223+1324++1n2(n+1)+的和為   

4.
limnnk=1cosk6nn(1+sink6n)的值為   

6.
x2+4y26x+5=0,已知的圖形經矩陣A=1aa1 變換後與y軸相切,求a值為   。(有兩解)

A=1aa1 ,圖形4x2+y26x+5=0,經A變化後與x軸相切,求a=
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12.
正方形DEFG的三頂點DFG分別落在ABC的三邊ABBCCA上,已知A=60 B=45 AB=6AD=2,求正方形DEFG的面積為   

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