作业帮找规律,求第N项表达式3,13,21,23,33,41,43,53.求第N项的表达式!
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找规律,求第N项表达式3,13,21,23,33,41,43,53.求第N项的表达式!
找规律,求第N项表达式
3,13,21,23,33,41,43,53.
求第N项的表达式!
找规律,求第N项表达式3,13,21,23,33,41,43,53.求第N项的表达式!
10*[n-(n+1除3)]+3
后一项和前一项的差分别是10，8，12，然后再循环
3 13 21
23 33 41
43 53 61
63 73 81
. . .
看出规律了吧
是N,N+10,N+18,N+20......