(1-1/2)×(1+1/2)×(1-1/3)×(1+1/3)×(1-1/4)×(1+1/4)×……接着上面:×(1-1/2000)×(1+1/2000)

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/09 12:41:06
(1-1/2)×(1+1/2)×(1-1/3)×(1+1/3)×(1-1/4)×(1+1/4)×……接着上面:×(1-1/2000)×(1+1/2000)

(1-1/2)×(1+1/2)×(1-1/3)×(1+1/3)×(1-1/4)×(1+1/4)×……接着上面:×(1-1/2000)×(1+1/2000)
(1-1/2)×(1+1/2)×(1-1/3)×(1+1/3)×(1-1/4)×(1+1/4)×……
接着上面:×(1-1/2000)×(1+1/2000)

(1-1/2)×(1+1/2)×(1-1/3)×(1+1/3)×(1-1/4)×(1+1/4)×……接着上面:×(1-1/2000)×(1+1/2000)

原式
=1/2x3/2x2/3x4/3x3/4x……x1999/2000x2001/2000
=1/2x(3/2x2/3x4/3x3/4x……x1999/2000)x2001/2000
=1/2x2001/2000
=2001/4000