(1+1⼀2)*(1-1⼀3)*(1+1⼀4)*(1-1⼀5)*......*(1+1⼀1998)=?

2025-01-03 02:19:45
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回答1:

(1-1/2)*(1+1/3)*(1-1/4)*(1+1/5)*......*(1-1/1998) =1/2*4/3*3/4*6/5*5/6*……*1998/1997*1997/1998 =1/2