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¶éÒ f"(x) > 0 ààÅéÇ f'(x)>f'(0) à»ç¹¨ÃÔ§ËÃ×Íà»ÅèÒ¤èÐ
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ÍéÒ§ÍÔ§:
µÑÇÍÂèÒ§ $f(x)=e^{2x},f'(x)=2e^{2x},f''(x)=4e^{2x}>f'(x)$ $f(x)=e^{x/2},f'(x)=\frac{1}{2}e^{x/2},f''(x)=\frac{1}{4}e^{x/2}<f'(x)$ |
¢Íá¡é⨷Âì´éÒ¹º¹¹èФèÐ
à¼ÍÔÇèÒ¾ÔÁ¾ì¾ÅҴ仹Դ¹Ö§ÍèФèÐ ÍÂÒ¡·ÃҺ͹ؾѹ¸ì¢Í§ $(\frac{a^x}{lna})'$ *¢ÍÇÔ¸Ô¤Ô´´éǹèФèÐ |
ÍéÒ§ÍÔ§:
$f'(x)=a^xlna$ ´Ñ§¹Ñé¹·Õè¶ÒÁ¡çµÍº $a^x$ |
f(x) Êèǹ´éÇ lna ÍÂÙèäÁèãªèàËÃͤèÐ
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ÍéÒ§ÍÔ§:
$f(x)=\frac{a^x}{lna}$ $f'(x)=\frac{a^xlna}{lna}=a^x$ |
àÇÅÒ·ÕèáÊ´§·Ñé§ËÁ´ à»ç¹àÇÅÒ·Õè»ÃÐà·Èä·Â (GMT +7) ¢³Ð¹Õéà»ç¹àÇÅÒ 10:28 |
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