小亚的奶奶利用围墙的一边，用栅栏围一个长36米，宽12米的长方形花圃，需围的栅栏有多长？
\u90bb\u8fb9\u4e0d\u7b49\u7684\u77e9\u5f62\u82b1\u5703ABCD\uff0c\u5b83\u7684\u4e00\u8fb9AD\u5229\u7528\u5df2\u6709\u7684\u56f4\u5899\uff0c\u53e6\u5916\u4e09\u8fb9\u6240\u56f4\u7684\u6805\u680f\u7684\u603b\u957f\u5ea6\u662f6m\uff0e\u82e5\u77e9\u5f62\u7684\u89e3\uff1a\u8bbeAB\u957f\u4e3ax\u7c73\uff0c\u5219BC\u957f\u4e3a\uff086-2x\uff09\u7c73\uff0e
\u4f9d\u9898\u610f\uff0c\u5f97x\uff086-2x\uff09=4\uff0e
\u6574\u7406\uff0c\u5f97x2-3x+2=0\uff0e
\u89e3\u65b9\u7a0b\uff0c\u5f97x1=1\uff0cx2=2\uff0e\uff083\u5206\uff09
\u6240\u4ee5\u5f53x=1\u65f6\uff0c6-2x=4\uff1b
\u5f53x=2\u65f6\uff0c6-2x=2\uff08\u4e0d\u7b26\u5408\u9898\u610f\uff0c\u820d\u53bb\uff09\uff0e
\u7b54\uff1aAB\u7684\u957f\u4e3a1\u7c73\uff0e
\u8c22\u8c22\u91c7\u7eb3\u554a
\uff081\uff09\u8bbe\uff1ax \u4e3a\u82b1\u5703\u957f\u5ea6\uff08\u4e0e\u5899\u5782\u76f4\uff09; \u4e2d\u95f4\u7684\u9694\u7bf1\u7b06\u957f\u5ea6\u4ea6\u4e3ax;
y \u4e3a\u82b1\u5703\u5bbd\u5ea6(AB)\uff08\u4e0e\u5899\u5e73\u884c\uff09\u3002
\u5219\uff1axy = 42;
3x + y = 24.
\u89e3\u6b64\u8054\u7acb\u65b9\u7a0b\u7b54\uff1ax= 4+\u221a2=5.414213562m.(\u53e6\u4e00\u6839x=4-\u221a2\uff0c\u5219Y=16.24264068 m \u5927\u4e8e\u662f10 m \u4e0d\u53ef\u53d6\uff09
\u82b1\u5703\u5bbd\u5ea6(AB): y = 24 - 3( 4 +\u221a2) = 7.757359313 m.
\uff082\uff09\u8bbe\uff1ax \u4e3a\u82b1\u5703\u957f\u5ea6\uff08\u4e0e\u5899\u5782\u76f4\uff09; \u4e2d\u95f4\u7684\u9694\u7bf1\u7b06\u957f\u5ea6\u4ea6\u4e3ax;
y \u4e3a\u82b1\u5703\u5bbd\u5ea6(AB)\uff08\u4e0e\u5899\u5e73\u884c\uff09\u3002
\u5219\uff1axy = 45;
3x + y = 24.
\u89e3\u6b64\u8054\u7acb\u65b9\u7a0b\u7b54\uff1ax = 5 m ,(\u53e6\u4e00\u6839 x=3m\uff0c\u5219Y=15 m\u5927\u4e8e\u662f10 m \u4e0d\u53ef\u53d6\uff09
\u82b1\u5703\u5bbd\u5ea6(AB): y = 9 m .
\uff083\uff09\u8bbe\uff1ax \u4e3a\u82b1\u5703\u957f\u5ea6\uff08\u4e0e\u5899\u5782\u76f4\uff09; \u4e2d\u95f4\u7684\u9694\u7bf1\u7b06\u957f\u5ea6\u4ea6\u4e3ax;
y \u4e3a\u82b1\u5703\u5bbd\u5ea6(AB)\uff08\u4e0e\u5899\u5e73\u884c\uff09\u3002
\u5219\uff1axy = 48;
3x + y = 24.
\u89e3\u6b64\u8054\u7acb\u65b9\u7a0b\u7b54\uff1ax = 4 m .
\u82b1\u5703\u5bbd\u5ea6(AB): y = 12 m \u8d85\u8fc7\u6700\u5927\u5899\u957f10m \u6545\u6b64\u65b9\u6848\u4e0d\u6210\u7acb\u3002
12+36x2=84(米）
36+12×2=60
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