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!](/uploads/image/z/203226-42-6.jpg?t=%E6%89%BE%E8%A7%84%E5%BE%8B%2C%E6%B1%82%E7%AC%ACN%E9%A1%B9%E8%A1%A8%E8%BE%BE%E5%BC%8F3%2C13%2C21%2C23%2C33%2C41%2C43%2C53.%E6%B1%82%E7%AC%ACN%E9%A1%B9%E7%9A%84%E8%A1%A8%E8%BE%BE%E5%BC%8F%21)
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......