-1/2+(-1/6)-(-1/4)-2/3
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-1/2+(-1/6)-(-1/4)-2/3
-1/2+(-1/6)-(-1/4)-2/3
-1/2+(-1/6)-(-1/4)-2/3
-1/2+(-1/6)-(-1/4)-2/3
(2/1-4/1)+(4/1-6/1)+(6/1-8/1)+.+(48/1-50/1)
(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+2/1)(1+4/1)(1+6/1).(1+10/)(1-3/1)(1—5/1).(1-9/1)
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
(1/2+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)
2/9除以【(1/2+1/6)*3/4】
(-1/4)+5/6+2/3-1/2
1/2+1/(2*4)+1/(2*4*6)+.这个数列怎么写法?