第四套中有几道题不明白啊~~请大家帮帮忙啊~~ 1.For a nonnegative integer n ,if the remainder is 1 when 2^n is divided by 3,then which of the following must be true? (1).n is greater than zero (2).3^n=(-3^n) (3).v2^n is an integer 答案:(2)和(3) ^代表次方的意思哦~~而那个v其实我也不知道是什么意思哦。。。
2.If x(x-5)(x-2)=0,is x negative? (1).x^2-7x不等于0 (2).x^2-2x不等于0 答案:C