濒海战斗舰 知乎:1/6+1/12+1/20+1/30+...+1/72
来源:百度文库 编辑:查人人中国名人网 时间:2024/04/29 05:32:33
是六分之一...
1/6+1/12+1/20+1/30+...+1/72
=1/2*3+1/3*4+1/4*5+1/5*6+...+1/8*9
=1/2-1/3+1/3-1/4+1/4-1/5+...+1/8-1/9
=1/2-1/9
=7/18
你们老师没教你数列啊
1/2+1/6+1/12+1/20+1/30
1/6+1/8+1/10+1/12+..........+1/202=?
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=?
“1/1/2+2/1/6+3/1/12+4/1/12+......20/1/420”怎么简算?
计算2/1+6/1+12/1……+90/1
1/2,1/6,1/12,(),1/30
1/6+1/12+1/20+1/30+...+1/72
1/6 =1/( )+1/( )+1/( )
7/12=1/?+1/?+1/?