问题描述:
(1)1/2*3+1/3*4+1/4*5.1/2006*2005
(2)1/2+1/(1+1)*(2+1)+1/(1+2)*(2+2).1/(1+2009)*(2+2009)
(3)1+1/(1+2)+1/(1+2+3)+.1/(1+2+3+4.100)
(2)1/2+1/(1+1)*(2+1)+1/(1+2)*(2+2).1/(1+2009)*(2+2009)
(3)1+1/(1+2)+1/(1+2+3)+.1/(1+2+3+4.100)
问题解答:
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