未分类题

若一次函数y=x+5的图象经过点P(a,b)和Q(c,d),则ad+bc-ac-bd的值是( ).
(A)9
(B)16
(C)25
(D)-25

A.
(A)9
(B)16

【参考答案】

参考D
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听力原文:W: Daddy, I have decided to give up science and go to business school.M: Well, it is your choice as long as you pay your own way, but I should ware you that not everyone with a business degree will make a successful manager.Q: What do we learn from the conversation?(2)A.The man doesn't have money for his daughter's graduate studies.B.The man doesn't think his daughter will get a business degree.C.The man insists that his daughter should pursue her studies in science.D.The man advises his daughter to think carefully before making her decision.
A.
M:
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Q:
C.The
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D.The
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未分类题
设☉O的半径是5,点P不在☉O外,若点O与P的距离|OP|=m2-2m+2,则m的取值范围是( ). (A)m <-1或m
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