可以只对部分变量取对数吗 对变量取对数有会么限制吗
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2. \u53d6\u5bf9\u6570\u540e\uff0c\u53ef\u4ee5\u5c06\u4e58\u6cd5\u8ba1\u7b97\u8f6c\u6362\u79f0\u52a0\u6cd5\u8ba1\u7b97\u3002
3. \u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u5728\u6570\u636e\u7684\u6574\u4e2a\u503c\u57df\u4e2d\u7684\u5728\u4e0d\u540c\u533a\u95f4\u7684\u5dee\u5f02\u5e26\u6765\u7684\u5f71\u54cd\u4e0d\u540c\u3002\u4f8b\u5982\uff0c\u4e2d\u6587\u5206\u8bcd\u7684mmseg\u7b97\u6cd5\uff0c\u8ba1\u7b97\u8bed\u7d20\u81ea\u7531\u5ea6\u65f6\u5019\u5c31\u53d6\u4e86\u5bf9\u6570\uff0c\u8fd9\u662f\u56e0\u4e3a\uff0c\u5982\u679c\u67d0\u4e24\u4e2a\u5b57\u7684\u9891\u7387\u5206\u522b\u90fd\u662f500\uff0c\u9891\u7387\u548c\u4e3a1000\uff0c\u53e6\u5916\u4e24\u4e2a\u5b57\u7684\u9891\u7387\u5206\u522b\u4e3a200\u548c800\uff0c\u5982\u679c\u5355\u7eaf\u6bd4\u8f83\u9891\u7387\u548c\u90fd\u662f\u76f8\u7b49\u7684\uff0c\u4f46\u662f\u53d6\u5bf9\u6570\u540e\uff0clog500=2.69897, log200=2.30103, log800=2.90308 \u8fd9\u65f6\u5019\u524d\u8005\u4e3a2log500=5.39794, \u540e\u8005\u4e3alog200+log800=5.20411\uff0c\u8fd9\u65f6\u524d\u8005\u7684\u548c\u66f4\u5927\uff0c\u53d6\u524d\u8005\u3002\u56e0\u4e3a\u524d\u9762\u4e24\u4e2a\u8bcd\u9891\u7387\u90fd\u662f500,\u53ef\u89c1\u90fd\u6bd4\u8f83\u5e38\u89c1\u3002\u540e\u9762\u6709\u4e2a\u8bcd\u9891\u662f200,\u8bf4\u660e\u4e0d\u592a\u5e38\u89c1\uff0c\u6240\u4ee5\u9009\u62e9\u524d\u8005\u3002\u4ecelog\u51fd\u6570\u7684\u56fe\u50cf\u53ef\u4ee5\u770b\u5230\uff0c\u81ea\u53d8\u91cfx\u7684\u503c\u8d8a\u5c0f\uff0c\u51fd\u6570\u503cy\u7684\u53d8\u5316\u8d8a\u5feb\uff0c\u8fd8\u662f\u524d\u9762\u7684\u4f8b\u5b50\uff0c\u540c\u6837\u662f\u76f8\u5dee\u4e86300,\u4f46log500-log200>log800-log500\uff0c\u56e0\u4e3a\u524d\u9762\u4e00\u5bf9\u7684\u6bd4\u540e\u9762\u4e00\u5bf9\u66f4\u5c0f\u3002\u5bf9\u6570\u503c\u5c0f\u7684\u90e8\u5206\u5dee\u5f02\u7684\u654f\u611f\u7a0b\u5ea6\u6bd4\u6570\u503c\u5927\u7684\u90e8\u5206\u7684\u5dee\u5f02\u654f\u611f\u7a0b\u5ea6\u66f4\u9ad8\u3002
4. \u53d6\u5bf9\u6570\u4e4b\u540e\u4e0d\u4f1a\u6539\u53d8\u6570\u636e\u7684\u6027\u8d28\u548c\u76f8\u5173\u5173\u7cfb\uff0c\u4f46\u538b\u7f29\u4e86\u53d8\u91cf\u7684\u5c3a\u5ea6\uff0c\u4f8b\u5982800/200=4, \u4f46log800/log200=1.2616\uff0c\u6570\u636e\u66f4\u52a0\u5e73\u7a33\uff0c\u4e5f\u6d88\u5f31\u4e86\u6a21\u578b\u7684\u5171\u7ebf\u6027\u3001\u5f02\u65b9\u5dee\u6027\u7b49\u3002
5. \u6240\u5f97\u5230\u7684\u6570\u636e\u6613\u6d88\u9664\u5f02\u65b9\u5dee\u95ee\u9898\u3002
6. \u5728\u7ecf\u6d4e\u5b66\u4e2d\uff0c\u5e38\u53d6\u81ea\u7136\u5bf9\u6570\u518d\u505a\u56de\u5f52\uff0c\u8fd9\u65f6\u56de\u5f52\u65b9\u7a0b\u4e3a lnY=a lnX+b \uff0c\u4e24\u8fb9\u540c\u65f6\u5bf9X\u6c42\u5bfc\uff0c1/Y*(DY/DX)=a*1/X, b=(DY/DX)*(X/Y)=(DY*X)/(DX*Y)=(DY/Y)/(DX/X) \u8fd9\u6b63\u597d\u662f\u5f39\u6027\u7684\u5b9a\u4e49\u3002
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您好。可以只对部分变量取对数的，只要是不影响到整个等式，取了对数之后这个等式仍然成立才可以绛旓細鎮ㄥソ銆鍙互鍙閮ㄥ垎鍙橀噺鍙栧鏁扮殑锛屽彧瑕佹槸涓嶅奖鍝嶅埌鏁翠釜绛夊紡锛屽彇浜嗗鏁颁箣鍚庤繖涓瓑寮忎粛鐒舵垚绔嬫墠鍙互
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