1x5分之4+5x9分之4+9x13分之4+...+37x41分之4
= 1-1/5+1/5-1/9+1/9-1/13+...+1/37-1/41
= 1-1/41
= 40/41
简便计算:1x5分之4+5x9分之4+9x13分之4+...+37x41分之4
简便计算:1x5分之4+5x9分之4+9x13分之4+...+37x41分之4
数学人气:370 ℃时间:2020-02-06 09:39:14
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