|1/3-1/4|+|1/4-1/5|+.+|1/19-1/20|=

来源：学生作业帮编辑：大师作文网作业帮分类：数学作业时间：2024/11/10 22:49:55

|1/3-1/4|+|1/4-1/5|+.+|1/19-1/20|
=(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+...+(1/19-1/20)
=1/3-1/4+1/4-1/5+1/5-1/6+...1/19-1/20
=1/3-1/20
=17/60

1/2*3+1/3*4+1/4*5+.+1/18*19+1/19*20=? |1/3-1/4|+|1/4-1/5|+.+|1/19-1/20|= (1-1/2)*(1-1/3)*(1-1/4)*(1-1/5)*(1-1/6)*…*（1-1/19）*（1-1/20）= 求1/2*3+1/3*4+1/4*5+.+1/18*19+1/19*20 1/2×3+1/3×4+1/4×5+.+1/18×19+1/19×20等于? 简算1/2*3+1/3*4+1/4*5+.+1/18*19+1/19*20 算式(3/1-4/1)+(4/1-5/1)……+(20/1-19/1)求解 1/2*3+1/3*4+1/4*5+1/5*6.+1/19*20 1/1*2*3+1/2*3*4+1/3*4*5+.+1/18*19*20 1*2*3/1+2*3*4/1+3*4*5/1+``````+18*19*20/1= 1-1/2+1/3-1/4+1/5-1/6+1/7-1/8+1/9……+1/19-1/20=? 1/2*1/3+1/3*1/4+1/4*1/5.+1/18*1/19+1/19*1/20