因为log x an 成等比数列所以log x an |log x an-1=x,x为正的常数又因为log x an =lgan|lgx所以log x an |log x an-1=lgan|lgan-1=x根据对数法则lgan|lgan-1=lg(an-an-1)=x所以an-an-1=x^10也为常数所以当n>=2时,an...