U^-14/U^10（U TO 附十四,U TO 十）（- -中文太烂了,难表达）

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U^-14/U^10（U TO 附十四,U TO 十）（- -中文太烂了,难表达）
反正答案是1/U^12,我想知道是为什么?
S^2 - 12s + 40
这题是prime吗?
75 - 20r + r^2
（直接给答案,如果能解释就更好了）
75 - 27u + u^2

1,U^-14/U^10
= 1/u^14 * u^10
=1/u^24
2,S^2 - 12S +40
b^-4ac

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