F.4 Quadratic Equation
回答 (1)
2007-10-27 8:33 am
✔ 最佳答案
(x - a)(x - a) - (x - a) = 0(x - a)(x - a - 1) = 0
(x - a)(x - (a + 1)) = 0
x = a or x = a + 1
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