f(x) = 1/2x² + lnx - mx
å®ä¹åï¼xï¼0
f â²(x) = x + 1/x - m = (âx-1/âx)² + 2-m = (x²-mx+1)/x
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fâ²(x) = (âx-1/âx)² + 2-m ⥠0
åè°å¢åºé´:(0ï¼+â)
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å½mï¼2æ¶ï¼
f â²(x) = (x²-mx+1)/x = {x-[m-â(m²-4)]/2} { {x-[m+â(m²-4)]/2}
åè°å¢åºé´ï¼ï¼0ï¼[m-â(m²-4)]/2ï¼ï¼ï¼[m+â(m²-4)]/2ï¼+âï¼
åè°ååºé´ï¼ï¼[m-â(m²-4)]/2ï¼m+â(m²-4)]/2ï¼
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