366. DS,问非1整数n是不是even number (1) 32是n的factor (2) n 是32的factor 答案肯定,each 选D 讨论稿思路:同意狗主人! 条件1,2与任何一个数相乘都是偶数,充分! 条件2,32的factor有1,2,4,8,16,32,均是偶数,充分! 选D。
1是偶数?? = =.....应该是笔误把
396 N is a perfect square, which one of the following is the least perfect square greater than N? 有两个选项,N+2√N+1和N^2。还是选择N+2√N+1,因为若N>=4,则N^2大于N+2√N+1;若N<4,则N只能等于1,N^2=N,不符合题中要求的greater than N