计算(请写出详细过程):(1-1/2²)(1-1/3²)(1-1/4²)······(1-
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(1-1/2²)(1-1/3²)(1-1/4²)······(1-1/2002²)(1-1/2003²)
=(1-1/2)(1+1/2)(1-1/3)(1+1/3).(1-1/2002)(1+1/2002)(1-1/2003)(1+1/2003)=1/2×3/2×2/3×4/3×...2001/2002×2003/2002×2002/2003×2004/2003=1/2×2/3×3/4×...×2001/2002×2002/2003×3/2×4/3×...×2003/2002×2004/2003=1/2003×2004/2=1002/2003;
=(1-1/2)(1+1/2)(1-1/3)(1+1/3).(1-1/2002)(1+1/2002)(1-1/2003)(1+1/2003)=1/2×3/2×2/3×4/3×...2001/2002×2003/2002×2002/2003×2004/2003=1/2×2/3×3/4×...×2001/2002×2002/2003×3/2×4/3×...×2003/2002×2004/2003=1/2003×2004/2=1002/2003;
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