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有一类数列,其奇数项与偶数项的通项公式不同,此类试题通常要求通项公式或前n项和.由于奇数项与偶数项所对应公式不同,同学们对这类题往往感到不好处理,
There is a series of numbers whose odd-numbered and even-numbered general terms are different. Such questions usually require the general term or the first n terms. Due to the difference between the odd-numbered and even-numbered formulas, students often feel that they are not Good deal,