1/49+2/49+3/49+4/49.47/49+48/49+47/49+.1/49的简便计算1/1*2*3+1/2*3*4+。_数学解答

1/49+2/49+3/49+4/49.47/49+48/49+47/49+.1/49的简便计算
1/1*2*3+1/2*3*4+。+1/8*9*10+1/9*10*11

人气：408 ℃　时间：2020-05-09 02:29:51

解答

1/49+2/49+3/49+4/49.47/49+48/49+47/49+.1/49
=（1/49+48/49）*（48/2）*2-48/49
=1*24*2-48/49
=48-48/49
=47又1/49