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发表于 22-4-2010 03:16 PM
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回复 80# Lov瑜瑜4ever
the question states that the equation has 3 real and distinct roots,no repeated root is allowed. Therefore the equation 2x^2+4x-2-b cannot has 2 as its root since 2 is a root already. |
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发表于 22-4-2010 03:21 PM
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回复 Lov瑜瑜4ever
the question states that the equation has 3 real and distinct roots,no repeat ...
數學神童 发表于 22-4-2010 03:16 PM 
噢噢噢
明白了
谢谢解释。。。 |
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