X/1*2+X/2*3+...+X/2006乘2007=2006,解方程,
人气：158 ℃ 时间：2020-05-27 20:53:12
解答
x/1*2+x/2*3++++x/2006*2007=
x/1-x/2+x/2-x/3++++x/2005-x/2006+x/2006-x/2007
=x-x/2007=2006x/2007=2006
x/2007=1
x=2007
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