高一数学 怎么判断求斜率公式中,在坐标中两个点哪个是x1,x2,y1,y2 求直线斜率的公式中如何确定X1Y1X2Y2
\u6c42\u76f4\u7ebf\u7684\u659c\u7387\u65f6\uff0c\u600e\u4e48\u77e5\u9053\u54ea\u4e2a\u662fx1\uff0cx2\u6c42\u76f4\u7ebf\u7684\u659c\u7387\u65f6\uff0cx1\uff0cx2\u662f\u81ea\u5df1\u5b9a\u7684\uff0c\u5404\u4eba\u5b9a\u7684\u53ef\u4ee5\u4e0d\u4e00\u6837\u3002
\u5173\u952e\u662fx1\u3001x2\u5206\u522b\u5bf9\u5e94y1\u3001y2\u4e0d\u8981\u641e\u9519\u3002
\u4f60\u53ef\u4ee5\u8bd5\u4e00\u4e0b\uff0c\u5148\u628aA\u70b9\u5750\u6807\u5b9a\u4e3a(x1\uff0cy1)\uff0cB\u70b9\u4e3a(x2\uff0cy2\uff09\u3002\u7136\u540e\u628aAB\u5750\u6807\u4e92\u6362\u4e00\u4e0b\uff0c\u53ef\u4ee5\u8bc1\u5b9e\uff0c\u533a\u522b\u5b9a\u4e49x1\uff0cx2\u7ed3\u679c\u90fd\u4e00\u6837\u3002
\u90ed\u6566\u9852\u56de\u7b54\uff1a
\u82e5\u4e24\u70b9\u5750\u6807\u5206\u522b\u662fA\uff08a₁\uff0cb₁\uff09\u548cB\uff08a₂\uff0cb₂\uff09\uff0c
\u4e60\u60ef\u4e0a\u786e\u5b9ax1= a₁\uff0cy1= b₁\uff1b x2 = a₂\uff0cy2= b₂\u3002
\u4f46\u4e5f\u53ef\u4ee5\u76f8\u53cd\uff0c\u800c\u662f\u786e\u5b9ax1= a₂\uff0cy1= b₂\uff1b x2 = a₁\uff0cy2= b₁\u3002
\u5c31\u662f\u8bf4\u4e24\u70b9\u5750\u6807\u4e60\u60ef\u4e0a\u786e\u5b9aA\uff08x1\uff0cy1\uff09\u548cB\uff08x2\uff0cy2\uff09\uff1b
\u4e5f\u53ef\u786e\u5b9a\u4e3aA\uff08x2\uff0cy2\uff09\u548cB\uff08x1\uff0cy1\uff09\u3002
\u786e\u5b9aA\uff08x1\uff0cy1\uff09\u548cB\uff08x2\uff0cy2\uff09\uff1b\u6216A\uff08x2\uff0cy2\uff09\u548cB\uff08x1\uff0cy1\uff09\u66f4\u591a\u5730\u8003\u8651\u7684\u662f\u8ba1\u7b97\u4e0a\u7684\u65b9\u4fbf\uff0c\u65b9\u4fbf\u6027\u8868\u73b0\u5728\u5750\u6807\u503c\u7684\u5927\u5c0f\u3001\u6b63\u8d1f\u30010\u5750\u6807\u7b49\u3002
\u91cd\u8981\u7684\u662f\uff0c\u4e0d\u80fd\u786e\u5b9a\u4e3aA\uff08x1\uff0cy2\uff09\u548cB\uff08x2\uff0cy1\uff09\u6216A\uff08x2\uff0cy1\uff09\u548cB\uff08x1\uff0cy2\uff09\u7684\u5f62\u5f0f\u3002
高的点为x2y2 低的点为x1y1 在一项线适用
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