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13问答网 > 2道高等数学题，高手们帮忙看看！谢谢了！麻烦大侠们写出分析过程~

2道高等数学题，高手们帮忙看看！谢谢了！麻烦大侠们写出分析过程~

2025-03-18 02:51:01

推荐回答（3个）

回答1：

(1)P(A+B)=P(A)+P(B)-P(AB)=0.6,P(B)-0.3，所以P(AB^-)=P(A-B)=P(A)-P(AB)=0.3

（2）极限不存在（因为沿不同曲线趋近时结果不唯一）

回答2：

P(A∪B)=P(A)+P(B)-P(AB)
P(Ab)=P(A)-P(AB)=P(A∪B)-P(B)=0.3
其中b为B非

回答3：

第一题的P代表什么意思？忘了。
第二题的答案是极限不存在。只要设y=kx，那么lim[xy/(x^2+y^2)]=lim [k/(1+k^2)]，这个极限随k而变非定值，所以极限不存在。

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