计算:(1+1*3/1)(1+2*4/1)……(1+9*11/1)

来源:百度知道 编辑:UC知道 时间:2024/05/04 13:02:40
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题目应该这样写
(1+1*1/3)(1+2*1/4) … … (1+9*1/11)=?
∵(1+1*1/3)=2*(1+1)/(1+2)
(1+2*1/4)=2*(2+1)/(2+2)
∴n项 1+n*(1/(n+2))=2*(n+1)/(n+2)
原式
= (2* 2/3) *(2*3/4) *...*(2*10/11)
= 2^9 * (2/3 *3/4 *...10/11)
= 2^9 * 2/11 = 2^10 /11
= 1024/11
祝你好运
吉林 汪清LLX