设直线kx+(k+1)y=1(k是正整数)与两坐标轴所围城图形的面积为S1,S2,……,S2010,则S1+S2+……+S2010
问题描述:
设直线kx+(k+1)y=1(k是正整数)与两坐标轴所围城图形的面积为S1,S2,……,S2010,则S1+S2+……+S2010
答
直线y=kx+k-1与x轴交点:((1-k)/k,0)直线y=(k+1)x+k与x轴交点:(-k/(k+1),0)直线y=kx+k-1和直线y=(k+1)x+k交点:(-1,-1)Sk=1/[2k(k+1)]S1+S2+...+S2010=1/(2•1•2)+1/(2•2•3)+...+1/(2...