F4 A-MATHS
回答 (2)
2007-05-24 6:51 am
參考: My Maths knowledge
2007-05-24 6:48 am
設直線 L 為 y - 3 = m (x - 1) ------------- (1)
x-intercept = -3/m + 1
y-intercept = -m + 3
1/2 (-3/m + 1) (-m + 3) = 25/4
化簡, 2m^2 + 13m + 18 = 0
由此, m = -2 or m = -9/2
代返入(1), 搵到兩條直線答案
x-intercept = -3/m + 1
y-intercept = -m + 3
1/2 (-3/m + 1) (-m + 3) = 25/4
化簡, 2m^2 + 13m + 18 = 0
由此, m = -2 or m = -9/2
代返入(1), 搵到兩條直線答案
收錄日期: 2021-04-23 21:06:09
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