1、(1+1/2)×(1-1/2)×···×(1+1/1999)×(1-1/1999)=?(1+1/1997+1/1998+1/1999)×(1/1997+1/1998+1/1999+1/2000)-(1+1/1997+1/1998+1/1999+1/2000)×(1/1997+1/1998+1/1999)=?各位能做多少就做多少···········第一题的答案是不
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![1、(1+1/2)×(1-1/2)×···×(1+1/1999)×(1-1/1999)=?(1+1/1997+1/1998+1/1999)×(1/1997+1/1998+1/1999+1/2000)-(1+1/1997+1/1998+1/1999+1/2000)×(1/1997+1/1998+1/1999)=?各位能做多少就做多少···········第一题的答案是不](/uploads/image/z/2994223-31-3.jpg?t=1%E3%80%81%281%EF%BC%8B1%2F2%29%C3%97%281%EF%BC%8D1%2F2%29%C3%97%C2%B7%C2%B7%C2%B7%C3%97%281%EF%BC%8B1%2F1999%29%C3%97%281-1%2F1999%29%3D%3F%281%2B1%2F1997%2B1%2F1998%2B1%2F1999%29%C3%97%281%2F1997%2B1%2F1998%2B1%2F1999%2B1%2F2000%29-%281%2B1%2F1997%2B1%2F1998%2B1%2F1999%2B1%2F2000%29%C3%97%281%2F1997%2B1%2F1998%2B1%2F1999%29%3D%3F%E5%90%84%E4%BD%8D%E8%83%BD%E5%81%9A%E5%A4%9A%E5%B0%91%E5%B0%B1%E5%81%9A%E5%A4%9A%E5%B0%91%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%E7%AC%AC%E4%B8%80%E9%A2%98%E7%9A%84%E7%AD%94%E6%A1%88%E6%98%AF%E4%B8%8D)
1、(1+1/2)×(1-1/2)×···×(1+1/1999)×(1-1/1999)=?(1+1/1997+1/1998+1/1999)×(1/1997+1/1998+1/1999+1/2000)-(1+1/1997+1/1998+1/1999+1/2000)×(1/1997+1/1998+1/1999)=?各位能做多少就做多少···········第一题的答案是不
1、(1+1/2)×(1-1/2)×···×(1+1/1999)×(1-1/1999)=?
(1+1/1997+1/1998+1/1999)×(1/1997+1/1998+1/1999+1/2000)-(1+1/1997+1/1998+1/1999+1/2000)×(1/1997+1/1998+1/1999)=?
各位能做多少就做多少···········
第一题的答案是不是1000/1999············
(1/11+1/21+1/31+1/41)×(1/21+1/31+1/41+1/51)-(1/11+1/21+1/31+1/41+1/51)×(1/21+1/31+1/41)=?
1、(1+1/2)×(1-1/2)×···×(1+1/1999)×(1-1/1999)=?(1+1/1997+1/1998+1/1999)×(1/1997+1/1998+1/1999+1/2000)-(1+1/1997+1/1998+1/1999+1/2000)×(1/1997+1/1998+1/1999)=?各位能做多少就做多少···········第一题的答案是不
1.设1/1997+1/1998+1/1999=a
(a+1)×(a+1/2000)-(1+a+1/2000)×a
=a²+a+1/2000a+1/2000-a-a²-1/2000a
=1/2000
2.设1/21+1/31+1/41=a
(1/11+a)×(a+1/51)-(1/11+a+1/51)×a
=(1/11)×(1/51)
=1/561