(2/1-4/1)+(4/1-6/1)+(6/1-8/1)+.+(48/1-50/1)
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(2/1-4/1)+(4/1-6/1)+(6/1-8/1)+.+(48/1-50/1)(2/1-4/1)+(4/1-6/1)+(6/1-8/1)+.+(48/1-50/1)(2/1-4/1)+(4/1
(2/1-4/1)+(4/1-6/1)+(6/1-8/1)+.+(48/1-50/1)
(2/1-4/1)+(4/1-6/1)+(6/1-8/1)+.+(48/1-50/1)
(2/1-4/1)+(4/1-6/1)+(6/1-8/1)+.+(48/1-50/1)
(2/1-4/1)+(4/1-6/1)+(6/1-8/1)+.+(48/1-50/1)
=1/2-1/4+1/4-1/6+1/6-1/8+.+1/48-1/50
=1/2-1/50
=12/25
(2/1-4/1)+(4/1-6/1)+(6/1-8/1)+......+(48/1-50/1)
=2/1-50/1.................................中间相等的两个数消去了
=50/24
=25/12
25分之12
你抄题了吧
(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+1/3+1/4+1/6)*24
(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)=
求和:1+(1+2)+(1+2+4)+(1+2+4+6)+(1+2+4+.2^n-1)
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+4/1-6/1~~~~+96/1-98/1+100/1)乘10
-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 + 1/6 + 1/12 + 1/20 + 1/30+ 1/42 + 1/56 + 1/72=(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)
(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)
1/(1*3)+1/(2*4)+1/(3*5)+1/(4*6)+...+1/(8*10)=?
10,1,8,1,6,2,4,6,2,().