|1/2-1|+|1/3-1/2|+|1/4-1/3|+.……|1/20-1/19|
7个回答
因为每一个绝对值中的数相减都为负,所以去掉绝对值要在前面加负号,最终为
(-1/2)+1-(1/3)+(1/2)-(1/4)+(1/3).(-1/20)+(1/19)=1-(1/20)=19/20
相关问题
1/2*1/3+1/3*1/4+1/4*1/5.+1/18*1/19+1/19*1/20
(2/1-3/1)+(3/1-4/1)+(4/1+5/1)+......+(19/1-20/1)=?
(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+……+(1/19-1/20)=
1/2*1 1/2*3 1/3*4 .1/20*19 1/20*21怎么简算
因为1/1×2=1-1/2,1/2×3=1/2-1/3.1/19×20=1/19-1/20
1/2×3+1/3*4+1/4*5+.+1/19*20=?
算式(1+1/2+1/3...+1/20)+(1+2/3+2/4+2/5..+2/20)+.+(1+18/19+18/2
(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+ ……+(1/19-1/20)的答案
1/3+1/(2*4)+1/(3*5)+1/(4+6).+1/(19*21)+1/(20*22)
1/1*2*3*4+1/2*3*4*5+1/3*4*5*6+-----+1/17*18*19*20