令 a^x = t ,
當(dāng)a>1時,t的范圍在(1/a,a).f(t)=t^2+2t-1.當(dāng)t=a時,f(t)取得最大值14.可解得a=3
當(dāng)0
(1)已知-1
(1)已知-1
數(shù)學(xué)人氣:428 ℃時間:2020-03-20 00:40:08
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