(10-2/55*1)+(9-2/55*2)+(8-2/55*3)+...+(1-2/55*10)=
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/06 13:13:22
![(10-2/55*1)+(9-2/55*2)+(8-2/55*3)+...+(1-2/55*10)=](/uploads/image/z/1247876-44-6.jpg?t=%2810-2%2F55%2A1%29%2B%289-2%2F55%2A2%29%2B%288-2%2F55%2A3%29%2B...%2B%281-2%2F55%2A10%29%3D)
x)045752ְ0LXS[OOO[@&Hmv6VORBQ2mCM1HYXN1H)g_\g |E
(10-2/55*1)+(9-2/55*2)+(8-2/55*3)+...+(1-2/55*10)=
(10-2/55*1)+(9-2/55*2)+(8-2/55*3)+...+(1-2/55*10)=
(10-2/55*1)+(9-2/55*2)+(8-2/55*3)+...+(1-2/55*10)=
(10-2/55*1)+(9-2/55*2)+(8-2/55*3)+...+(1-2/55*10)
= (10+9+8+…+1)-2/55*(1+2+3+…10)
= (1-2/55)*(1+2+3+…10)
=53/55*55
=53