高等数学第五题,有什么简单方法吗
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设所求平面方程是 x/a+y/b+z/c = 1,
平面过已知两点,则 1/a+2/b-1/c = 1, -5/a+2/b+7/c = 1,
另由题设 a+b+c = 0.
前两式得 6/a-8/c = 0, c =4a/3, 代入a+b+c = 0. 得 b = -7a/3,
则 1/a - 6/(7a) - 3/(4a) = 1, 得 a = -17/28, b = 17/12, c = -17/21,
设所求平面方程是 28x-12y+21z = -17.
平面过已知两点,则 1/a+2/b-1/c = 1, -5/a+2/b+7/c = 1,
另由题设 a+b+c = 0.
前两式得 6/a-8/c = 0, c =4a/3, 代入a+b+c = 0. 得 b = -7a/3,
则 1/a - 6/(7a) - 3/(4a) = 1, 得 a = -17/28, b = 17/12, c = -17/21,
设所求平面方程是 28x-12y+21z = -17.
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