解答

1.
2/3 x^2 - 5/6 x -1
= 1/6*(4x^2 -5x -6)
= 1/6*(x -2)(4x +3) => m = -2, n = 3
mn = -6

3.
把 x = -2 代入可得:
4 -2m -2m = 0
4m = 4, m = 1
x^2 +x -2 = 0
(x +2)(x -1) = 0
x = -2 or 1

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