问题描述:
1/2+(1/3+2/3)+(1/4+2/4+3/4)+···+(1/10+2/10+···9/10)
还有这道(1+1/2)*(1+1/4)*(1+1/6)*···*(1+1/10)*(1-1/3)*(1-1/5)*···*(1-1/9)
还有这道(1+1/2)*(1+1/4)*(1+1/6)*···*(1+1/10)*(1-1/3)*(1-1/5)*···*(1-1/9)
问题解答:
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