有理数集 简称 Q the set of rational numbers 这个解释中没Q 请问简称Q是国际统一的强行规定吗

有理数集 简称 Q the set of rational numbers 这个解释中没Q 请问简称Q是国际统一的强行规定吗 有理数为什么简称是Q? set of the in the set of circle U Q set the Set P consists of all the positive even integers less than 14,and set Q consists of all the positive multiples of 3 less than 21.Set R consists of all members that are either in set P or set Q.How many members of set R are even?(A) 6(B) 7(C) 9(D) 10( the set of 的意思 这题看不懂,P is the set of positive factors of 20 and Q is the set of positive factors of 12.If x is a member of set P and y is the member of set Q,what is the greatest possible vaule of x-y?答案是19. 英译汉!Q is the potimal value of a parametric problem on a compact set ,with a cinvex objective function.(potimal value 最优值,parametric problem compact set 紧集,convex objective function 凸目标函数. 关于数学的名词!自然数集,整数集,有理数集,实数集有关集合的问题!为什么自然数集,简称 N,(应该是 Natnral)整数集 简称 Z.那全称应该是什么呢?有理数集 简称 Q 又是什么呢?实数集 简称 R 应该 set the basis of 啥意思? Are the set of the keys ..? 还是Is the set of keys .? Bad weather ___the construction of the building by one month.a、set upb、set backc、set offd、set down the graph of the set of real numbers 董事长chairman of the board英文简称是什么,谢谢. A group of scientists _____ the west of the country.A.have set off B.have set out for C.have set off for C,set out 英语翻译Elementary logic and AlgebraPropositional calculus,quantifiers.Arguments ad absurdo,by recursion.Set and function terminology,sets N,Z and Q:arithmetic and combinatorics,Polynomials:Euclidian division.Properties of the set RInterval,neigh The story ___(set) in the spring of 1934.