f(x) = e^x-x æé¶ç¹åï¼ï¼ææ e^x > x å§ï¼ï¼ï¼ï¼åºè¯¥æ¯ f(x) = e^x+x å§ï¼ï¼ï¼ï¼å°±è¿æ ·äºã
å 为 f(-1) = e^(-1)-1 = 1/e-1 < 0 ï¼f(0) = e^0+0 = 1 > 0 ï¼æ以 -1 < a < 0 ï¼
å g(1/2) = ln(1/2)+1/2 = (1-ln4)/2 < 0 ï¼f(1) = ln1+1 = 1 > 0 ï¼æ以 1/2 < b < 1 ï¼
å 为 h(2) = ln2-1 < lne -1 = 0 ï¼h(3) = ln3-1 > lne-1 = 0 ï¼æ以 2 < c < 3 ï¼
å æ¤å¯å¾ a < b < c ã
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