2x的平方ln2图像怎么画 2x-lnx的图像怎么画
y=2x\u7684\u56fe\u50cf\u600e\u4e48\u753b\u4e8c\u5143\u4e00\u6b21\u65b9\u7a0b\u5173\u7cfb\u5f0f\u786e\u5b9a\u56fe\u50cf\u4e3a\u4e00\u6761\u76f4\u7ebf\uff0c\u4e24\u70b9\u786e\u5b9a\u4e00\u6761\u76f4\u7ebf\uff0c\u901a\u8fc7\u51fd\u6570\u5173\u7cfb\u5f0f\u53ef\u4ee5\u7b97\u51fa\u56fe\u50cf\u7ecf\u8fc7\uff080\uff0c0\uff09\u548c\uff081\uff0c2\uff09\uff0c\u53ef\u4ee5\u753b\u51fa\u51fd\u6570\u56fe\u50cf\u4e3a
\u4e00\u6b21\u51fd\u6570\u662f\u51fd\u6570\u4e2d\u7684\u4e00\u79cd\uff0c\u4e00\u822c\u5f62\u5982y=kx+b\uff08k\uff0cb\u662f\u5e38\u6570\uff0ck\u22600\uff09\uff0c\u5176\u4e2dx\u662f\u81ea\u53d8\u91cf\uff0cy\u662f\u56e0\u53d8\u91cf\u3002\u7279\u522b\u5730\uff0c\u5f53b=0\u65f6\uff0cy=kx\uff08k\u4e3a\u5e38\u6570\uff0ck\u22600\uff09\uff0cy\u53eb\u505ax\u7684\u6b63\u6bd4\u4f8b\u51fd\u6570\uff08direct proportion function\uff09\u3002
\u6269\u5c55\u8d44\u6599\uff1a
\u4e00\u6b21\u51fd\u6570\u7684\u51fd\u6570\u6027\u8d28
1\u3001y\u7684\u53d8\u5316\u503c\u4e0e\u5bf9\u5e94\u7684x\u7684\u53d8\u5316\u503c\u6210\u6b63\u6bd4\u4f8b\uff0c\u6bd4\u503c\u4e3ak\u3002
\u5373\uff1ay=kx+b\uff08k\u22600\uff09\uff08k\u4e0d\u7b49\u4e8e0\uff0c\u4e14k\uff0cb\u4e3a\u5e38\u6570\uff09\u3002
2\u3001\u5f53x=0\u65f6\uff0cb\u4e3a\u51fd\u6570\u5728y\u8f74\u4e0a\u7684\u4ea4\u70b9\uff0c\u5750\u6807\u4e3a\uff080\uff0cb\uff09\u3002
\u5f53y=0\u65f6\uff0c\u8be5\u51fd\u6570\u56fe\u8c61\u5728x\u8f74\u4e0a\u7684\u4ea4\u70b9\u5750\u6807\u4e3a\uff08-b/k\uff0c0\uff09\u3002
3\u3001k\u4e3a\u4e00\u6b21\u51fd\u6570y=kx+b\u7684\u659c\u7387\uff0ck=tan\u03b8\uff08\u89d2\u03b8\u4e3a\u4e00\u6b21\u51fd\u6570\u56fe\u8c61\u4e0ex\u8f74\u6b63\u65b9\u5411\u5939\u89d2\uff0c\u03b8\u226090\u00b0\uff09\u3002
4\u3001\u5f53b=0\u65f6\uff08\u5373y=kx\uff09\uff0c\u4e00\u6b21\u51fd\u6570\u56fe\u8c61\u53d8\u4e3a\u6b63\u6bd4\u4f8b\u51fd\u6570\uff0c\u6b63\u6bd4\u4f8b\u51fd\u6570\u662f\u7279\u6b8a\u7684\u4e00\u6b21\u51fd\u6570\u3002
5\u3001\u51fd\u6570\u56fe\u8c61\u6027\u8d28\uff1a\u5f53k\u76f8\u540c\uff0c\u4e14b\u4e0d\u76f8\u7b49\uff0c\u56fe\u50cf\u5e73\u884c\uff1b
\u5f53k\u4e0d\u540c\uff0c\u4e14b\u76f8\u7b49\uff0c\u56fe\u8c61\u76f8\u4ea4\u4e8eY\u8f74\uff1b
\u5f53k\u4e92\u4e3a\u8d1f\u5012\u6570\u65f6\uff0c\u4e24\u76f4\u7ebf\u5782\u76f4\u3002
6\u3001\u5e73\u79fb\u65f6\uff1a\u4e0a\u52a0\u4e0b\u51cf\u5728\u672b\u5c3e\uff0c\u5de6\u52a0\u53f3\u51cf\u5728\u4e2d\u95f4\u3002
y=2x-lnx \u5b9a\u4e49\u57dfx>0
y'=2-1/x\uff0c\u9a7b\u70b9x=½
y''=1/x²>0 y(½)=1+ln(2)\u662f\u6781\u5927\u503c\uff0c\u51fd\u6570\u4e3a\u51f9\u66f2\u7ebf\u3002
\u7528\u63cf\u70b9\u6cd5\u53ef\u5f97\u5230\u51fd\u6570\u7684\u56fe\u50cf\u3002
2x²ln2的图像：
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