標題:
F.5 Maths! prove log ..
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最佳解答:
呢題係prove或是solve x? 2009-05-17 17:59:21 補充: 我當呢題係solve x去計: 圖片參考:http://i707.photobucket.com/albums/ww74/stevieg90/03-14.gif
其他解答:
log( 2做底 ) [(4^x-2)-12] = x-2 Log2[(4x-2)-12]<=x-2 Log2[(4x-2)-12]<= Log22 x-2 4 x-2-12<=2 x-2 (2 x-2)2-12<=2 x-2 (2 x-2)2-2 x-2-12<=0 (2 x-2-4)( 2 x-2 +3) <=0 (2 x-2-4) <=0 或 ( 2 x-2 +3) <=0 2 x-2<=4 或 2 x-2<=-3 (捨去) 2 x-2<=22 因此, x<=4 祝福你身心快樂!學業進步! 主恩滿溢!
F.5 Maths! prove log ..
發問:
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log( 2做底 ) [(4^x-2)-12] = x-2 Help!最佳解答:
呢題係prove或是solve x? 2009-05-17 17:59:21 補充: 我當呢題係solve x去計: 圖片參考:http://i707.photobucket.com/albums/ww74/stevieg90/03-14.gif
其他解答:
log( 2做底 ) [(4^x-2)-12] = x-2 Log2[(4x-2)-12]<=x-2 Log2[(4x-2)-12]<= Log22 x-2 4 x-2-12<=2 x-2 (2 x-2)2-12<=2 x-2 (2 x-2)2-2 x-2-12<=0 (2 x-2-4)( 2 x-2 +3) <=0 (2 x-2-4) <=0 或 ( 2 x-2 +3) <=0 2 x-2<=4 或 2 x-2<=-3 (捨去) 2 x-2<=22 因此, x<=4 祝福你身心快樂!學業進步! 主恩滿溢!
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