1/a(a+1)+1/(a+1)(a+2)+1/(a+2)(a+3)……1/(a+2009)(a+2010)怎么解

来源:学生作业帮助网 编辑:作业帮 时间:2024/12/01 14:17:34
1/a(a+1)+1/(a+1)(a+2)+1/(a+2)(a+3)……1/(a+2009)(a+2010)怎么解
x)3OH66@1q55,"%X泆';;^,_lTOs l碧} 5 f.0mA2 f t#`7B 젎s^dǪgS7<_dg3֛Y蘘 K9řyŎ|ڿꝛM S`V$@! 1|C}#$g>Z

1/a(a+1)+1/(a+1)(a+2)+1/(a+2)(a+3)……1/(a+2009)(a+2010)怎么解
1/a(a+1)+1/(a+1)(a+2)+1/(a+2)(a+3)……1/(a+2009)(a+2010)怎么解

1/a(a+1)+1/(a+1)(a+2)+1/(a+2)(a+3)……1/(a+2009)(a+2010)怎么解
原式=1/a-1/(a+1)+1/(a+1)-1/(a+2)+……+1/(a+2009)-1/(a+2010)
=1/a-1/(a+2010)
=2010/a(a+2010)

这个数可以是4290,4590,4890
sinA+cosA=根号2
平方
sin2A+cos2A+2sinA*cosA=2
1+2sinA*cosA=2
sinA*cosA=1/2