首页
登录
职称英语
If p and r are prime numbers, which of the following must also be prime?A、prB、p
If p and r are prime numbers, which of the following must also be prime?A、prB、p
游客
2025-02-24
49
管理
问题
If p and r are prime numbers, which of the following must also be prime?
选项
A、pr
B、p+r
C、pr+1
D、p2+r2
E、None of the above
答案
E
解析
若p和r是质数(prime number),则下面哪一个也一定是质数?
解:本题的正确答案为(E)。此题可用排除法。质数就是除了1和它本身之外,没有其他因子的数,因此(A)选项是显然不正确的;由5+7=12可以断定(B)也是错误的,实际上两个质数的和为偶数;5×7+1=36可认定(C)是错误的;(D)也肯定不是质数,所以也是错误的。
转载请注明原文地址:http://tihaiku.com/zcyy/3971248.html
相关试题推荐
Thefollowingappearedinthesummaryofastudyonheadachessufferedbythere
Thefollowingappearedinalettertotheeditorofajournalonenvironmentali
Thefollowingappearedinamemofromthedirectorofalargegroupofhospitals
Thefollowingappearedasarecommendationbyacommitteeplanningaten-yearbu
Thefollowingisalettertotheeditorofanenvironmentalmagazine."Twostudi
ThefollowingappearedaspartofanarticleinaDilltonnewspaper."Inaneffo
Thefollowingappearedinahealthnewsletter.Nosiniaisaherbthatmanyusers
Whichofthefollowingnumbersisbothafactorof48andamultipleof6?A、2B
4-n□64-n□5Whichofthefollowingsymbolsshouldbesubstitutedfor□tom
Forallrealnumberspandr,p◇r=pr-p+r.ColumnAColumnB
随机试题
[originaltext](Woman)Aren’tyougoingtoworkoutsidetoday?(Man)(A)No,I
UniversityPhysicsisintendedforstudentsofscienceandengineering.Pri
Youaretowritein100-120wordsonthetopicHowtoSucceedinaJobIntervie
[originaltext]W:I’mlosingmysleep.Ifeeltiredandsleepyallthetime.I’v
[originaltext]W:Youareanexpertonurbanproblem,Mr.Parker.Iwonderhowy
在电器化比较普及的中国,海尔电器凭借自己在洗衣机行业的技术优势,以低成本挑战市场
水泥的安定性是指水泥浆在硬化时()的性质。A.产生高密实度 B.体积变化均匀
评价新药的安全性、有效性,对上市药品的再评价,对药物不良反应的监察等的是A.药物
根据民事法律制度的规定,下列各项中,属于双方民事法律行为的是()。A.代理
根据应急预案体系的构成,针对危险源和应急保障而编制的应急预案属于( )。A.专
最新回复
(
0
)