丨xy-2丨与丨y-1丨互为相反数,由于这两个式子都不是负数,也就没有正数,因此都等于0,因此Y=1,X=2
1/xy+1/(x+1)(y+1)+1/(x+2)(y+2)+……+1/(x+2011)(y+2010)
=1/(2*1)+1/(3*2)+1/(4*3)+ .+1/(2013*2012)
=1/1-1/2+1/2-1/3+1/3-1/4+.+1/2012-1/2013
=1/1-1/2013
=2012/2013
这是第1题
丨xy-2丨与丨y-1丨互为相反数,由于这两个式子都不是负数,也就没有正数,因此都等于0,因此Y=1,X=2
1/xy+1/(x+1)(y+1)+1/(x+2)(y+2)+……+1/(x+2011)(y+2010)
=1/(2*1)+1/(3*2)+1/(4*3)+ .+1/(2013*2012)
=1/1-1/2+1/2-1/3+1/3-1/4+.+1/2012-1/2013
=1/1-1/2013
=2012/2013
这是第1题