2003(1-1/2)(1-1/3)(1-1/4).....(1-1/2003)
=2003*1/2*2/3*3/4*.....*2002/2003
=2003*1/2003
=1
2003 X 1/2 X 2/3 X 3/4 X ....... X 2002/2003 = 2003 X 1/2003 =1,老师讲的。
2003 X 1/2 X 2/3 X 3/4 X ....... X 2002/2003 = 2003 X 1/2003 =1
1/2 + 2/3 + 3/4。。。。+ 2002/2003 =1
2003 X 1/2 X 2/3 X 3/4 X ....... X 2002/2003 =
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