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令2^x=t,則t>0 y=4^x-3*2^x+3 =(2^x)^2-3*2^x+3 =t^2-3t+3……其中t>0 =(t-3/2)^2+3/4 因為(t-3/2)^2大於等於0, 故y≥3/4
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