【简答题】记[x]为不超过实数x的最大整数,例如,[2]=2,[1.5]=1,[-0.3]=-1。设a为,数列{x n }满足x 1 =a, ,现有下列命题: ①当a=5时,数列{x n }的前3项依次为5,3,2; ②对数列{x n }都存在k,当n≥k时总有x n =x k ; ③当n≥1时, ; ④对某个k,若x k+1 ≥x k ,则 。 其中的真命题有( )(写出所有真命题...
【简答题】听较长对话,回答问题 1.What does Tom play? A. The piano. B. The drums. C. The guitar. 2.Where does Tom play? A. At school. B. In a club. C. In his be droom. 3.When does Tom have breakfast? A. At five o’clock. B...