(1)-1/2-1/6-1/12-1/20-...-1/42(2)已知|a-1|+(b+2)^2=0,求(a+b)^1001的值“^”代表次方
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1/2+1/6+1/12+1/20(简算)
(1)1-1/2-1/6-1/12-1/20-...-1/9900(2)1/2+1/6+1/12+1/20+...+1/9900(3)1/3+1/15+1/35+1/63+...+1/9999
(1/4+1/6-1/2)×12
(1/4+1/6-1/2)×12
1/2+1/6+1/12+1/20.+1/380
2%1+6%1+12%1+20%1+30%1
1/2+1/6+1/12+1/20+1/30
1/2-1/6-1/12-1/20-...-1/110
1/2,-1/6,1/12,-1/20,1/30
2/1+6/1+12/1+24/1+48/1
1/2+1/6+1/12+1/20+.1/90
2/1+6/1+12/1+20/1+...+2450/1
-12*(2又1/4-1又1/2+1又1/6-1又1/12)
1/2+1/6+1/12+1/20+1/30+1/42(简便运算)
计算 1/2+ 1/6+ 1/12+ 1/20+1/30 +1/42 的值.( )
1-1/2-1/6-1/12-1/20-…-1/(99*100)经过
找规律填空:1/12,1/6,1/4,1/3,5/12,1/2,().
1/2,1/3,5/6,( ),12/6,( )