数学题-1/10*11-1/11*12-1/12*13.-1/19*20=?
1个回答
原式=-(1/10-1/11+1/11-1/12+1/12-1/13+……+1/19-1/20)
=-(1/10-1/20)
=-1/20
相关问题
初中数学-1/10*11-1/11*12-1/12*13.-1/19*20
-1/10*11-1/11*12-1/12*13-……-1/19*20
-1/10×11-1/11×12-1/12×13—……—1/19×20
1/10*11+1/11*12+...+1/19*20=?
计算:-1/10*11-1/11*12-……-1/19*20
|1/10-1/11|+|1/11-1/12|+…|1/19-1/20|
几道初中计算题-1/10乘11 - 1/11乘12 - 1/12乘13 .- 1/19乘20-1/2 - 1/6 - 1
(1/10+1/11+1/12+1/13)*(1/11+1/12+1/13+1/14)-(1/10+1/11+1/12+
1/10×11+1/11×12+…+1/19×20
|1/11-1/10|+|1/12-1/11|+|1/13-1/12|-|1/13-1/10|=?