请分析一下答案是怎样来的,第一题6,24,60,120,( )答案A160 B350 C210 D480第二题0.001,0.002,0.006,0.024,( )答案A0.045 B0.12 C0.038 D0.24第三题3/2,5/6,7/12,9/20,( A11/24 B11/30 C13/40 D13/48
问题描述:
请分析一下答案是怎样来的,
第一题6,24,60,120,( )答案A160 B350 C210 D480第二题0.001,0.002,0.006,0.024,( )答案A0.045 B0.12 C0.038 D0.24第三题3/2,5/6,7/12,9/20,( A11/24 B11/30 C13/40 D13/48
答
第一题6,24,60,120,(C和D)
答案可选C和D,C(210)和D(480)都可被6整除,它们都与前面四个都没有明确的规律,唯一的规律就是都能被6整除.
第二题0.001,0.002,0.006,0.024,(B)
规律是第二个数是第一个数的2倍,第三个数是第二个数的3倍,第四个数是第三个数的4倍,那么第五个就必定是第四个的5倍,所以0.024*5=0.12,所以是B.
第三题3/2,5/6,7/12,9/20,(B)
规律是:分子是等差数列,3,5,7,9,接下去就肯定是11;分母也是等差数列,6-2=4,12-6=6,20-12=8,后面的差就是10,所以,20+10=30,答案是11/30.