初中数学题库
2025-09-01
(1/10)x(1/11)+(1/11)x(1/12)+.........+(1/100)x(1/101) =1/10-1/11+1/11-1/12+..........+1/100-1/101 =1/10-1/101 =91/1010....
2025-09-01
(1/10)x(1/11)+(1/11)x(1/12)+.........+(1/100)x(1/101) =1/10-1/11+1/11-1/12+..........+1/100-1/101 =1/10-1/101 =91/1010....