a1=n,an=3*a(n-1)
s5=a1+a2+a3+a4+a5=605
a1=5
the value of a is 5
一道很简单的sat数学题!
一道很简单的sat数学题!
The first term in the sequence above us a,and each term after the first is 3 times the preceeding term.If the sum of the first 5 terms is 605,what is the value of
The first term in the sequence above us a,and each term after the first is 3 times the preceeding term.If the sum of the first 5 terms is 605,what is the value of
英语人气：651 ℃时间：2020-03-30 07:46:53
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