若la-1l+lab-2l=0,求1/ab+1/(a+1)(b+1)+...+1/(a+2002)(b+2003)的和初中一年尖子生题库上的一道数学题

已知lab+2l+la+1l=0,求1/(a-1)(b+1)+1/(a-2)(b+2)...+1/(2-2004)(b+2004) 若la-1l+lab-2l=0,求1/ab+1/(a+1)(b+1)+...+1/(a+2002)(b+2003)的和初中一年尖子生题库上的一道数学题 如果la-1l+lab-2l=0.求1/ab+1/(a+1)(b+1)+...+1/(a+2004)(b+2004) 已知lab-2l+la-2l=0,求1/ab+1/(a+1)(b+1)+1/(a+2)(b+2)+```+1/(a+2006)(b+2006)的值 la+3l+lb-2l+c+1l=0求a+b+c 已知lab+2l+la+1l+0,则代数式1/（a-1)(b+1) +1/（a-2)(b+2)+^+1/(a-2009)(b+2009) la-1l+lb-2l=0,求a+b的值 la-1/2l+lb-1/3l+lc-1/4l=0,求a+b+c的值. 若la-5l+lb+6l=0,求-b-a-(-2/3)的值 la-1l+lb+3l=0求b-a-0.5的值 la一1l十lb一2l＝0求a十b 若lab-2l+(b-1)²=0,求“1/ab+1/(a+1)(b+1)+…+1/(a+2012)(b+2012)”怎么做? la-2l=5,lb+1l=4 且ab＜0求a+b-ab的值 已知:lab-2l与lb-1l互为相反数试求式子已知:la-2l与lb-1l互为相反数试求式子 1 1 1 1 ---+---+---+...+--- 的值 ab (a+1)(b+1) (a+2)(b+2) (a+2009)(b+2009) 已知la+1l+lb-2l+lc+3l=0,求lal+lbl+lcl的值 若lab-2l=(a-1)*2=o求1/ab+1/(a+1)(b+1)+……+1/(a+2008)(b+2008) a.b满足lab-2l+l1-bl=0,求1/ab+1/(a+1)(b+2)++2)+.+1/(a+2008)(b+2008)的值如题 la-1/2l+lb-1/3l+lc-1/4l=0那么a+b-c=?