|1/3—1/4|+|1/4—1/5|+……+|1/19—1/20|+=?怎么计算?
4个回答
=1/3-4/1+1/4-1/5+1/5``````-1/19+1/19-1/20
一一抵消
=1/3-1/20=17/60
相关问题
计算:|[1/3]-[1/4]|+|[1/4]-[1/5]|+…+|[1/19]-[1/20]|.
计算:|[1/4]-[1/3]|+|[1/5]-[1/4]|+|[1/6]-[1/5]|+…+|[1/20]-[1/19
|1/3-1/4|+|1/4-1/5|+……+|1/20-1/19|怎么算?
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)=
1/2×3+1/3*4+1/4*5+.+1/19*20=?
1/2*3*4+1/3*4*5+1/4*5*6……+1/19*20*21+1/20*21*22=
1/3*4+1/4*5+1/5*6+1/6*7...1/19*20
1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+.+1/18x19+1/19x20 计算方法与结果