-1/2+(-1/6)-(-1/4)-(+2/3),
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x[N1E*8M@NtG;tX{jBkvO/gR9K%tWMڊs[ElFmE~aXLtWŰ͋IBmf'e7O7ⵝ[0U7@jU}<*RI( KIi>pv$+n~WbfA愐1fM%PFBіD#Y.1^<7Ǣ?biQͦhL4h"h$r%$]X邪wbsx,,ϩ:2Er֔T5eG}?&?N
(2/1-4/1)+(4/1-6/1)+(6/1-8/1)+.+(48/1-50/1)
-1/2+(-1/6)-(-1/4)-2/3
(1+2/1)(1+4/1)(1+6/1).(1+10/)(1-3/1)(1—5/1).(1-9/1)
(1/2+1/3+1/4+1/6)*24
求和:1+(1+2)+(1+2+4)+(1+2+4+6)+(1+2+4+.2^n-1)
10,1,8,1,6,2,4,6,2,().
1/2-(3/4-3/8),1/2+1/4-1/6 ,2/3+(1/2+1/4),1/2-(3/4-3/8),1/2+1/4-1/6 ,2/3+(1/2+1/4),
1/2-(3/4-3/8), 1/2+1/4-1/6 , 2/3+(1/2+1/4),1/2-(3/4-3/8), 1/2+1/4-1/6 , 2/3+(1/2+1/4),
1/2-(3/4-3/8),1/2+1/4-1/6 ,2/3+(1/2+1/4),1/2-(3/4-3/8),1/2+1/4-1/6 ,2/3+(1/2+1/4),
1.(1+1/2+1/3+1/4)*(1/2+1/3+1/4+1/5)-(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4)=2.(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4+1/5+1/6)-(1+1/2+1/3+1/4+1/5+1/6)*(1/2+1/3+1/4+1/5)=
-72×(1/4+1/6+1/2)
计算:-72×(1/4+1/6-1/2)
(1/4+1/6-1/2)×12
(1/4+1/6-1/2)×12
(1-1/2)+ (1/3-1/4)+ (1/5-1/6)...+ (1/99-1/100)=?
(1-2/1+4/1-6/1~~~~+96/1-98/1+100/1)乘10
1/(1*3)+1/(2*4)+1/(3*5)+1/(4*6)+...+1/(8*10)=?
(1/2+1/3+1/4+1/5+1/6+.+1/2013)*(1+1/2+..+1/2012)-(1+1/2+1/3+1/4+...+1/2013)*(1/2+.+1/2012)(1/2+1/3+1/4+1/5+1/6+...+1/2013)*(1+1/2+1/3+1/4...+1/2012)-(1+1/2+1/3+1/4+...+1/2013)*(1/2+1/3+1/4+...+1/2012)