数学坐标斜率
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设 P 的坐标为 (0
b)。 KP 的斜率: (b + 5)/(0 - 3) = -3/4 (b + 5)/3 = 3/4 4(b + 5) = 9 4b + 20 = 9 4b = -11 b = -11/4 p 的坐标 = (0
-11/4)
参考: 卖女孩的火柴
Please Check!! Point P at Y-AXIS
the coordinate of P SHOULD BE (0
Y)
Let p be (x
0) 0-(-5) -3 --------- = ------ x-3 4 20 = -3x+9 3x = -11 x = -11/3 2014-02-27 13:53:38 补充: Ans: p is (-11/3
0)
b)。 KP 的斜率: (b + 5)/(0 - 3) = -3/4 (b + 5)/3 = 3/4 4(b + 5) = 9 4b + 20 = 9 4b = -11 b = -11/4 p 的坐标 = (0
-11/4)
参考: 卖女孩的火柴
Please Check!! Point P at Y-AXIS
the coordinate of P SHOULD BE (0
Y)
Let p be (x
0) 0-(-5) -3 --------- = ------ x-3 4 20 = -3x+9 3x = -11 x = -11/3 2014-02-27 13:53:38 补充: Ans: p is (-11/3
0)
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