1/(2+4)+1/(4+6)+1/(6+8)+…1/(2010+2012)怎么做
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1/(2+4)+1/(4+6)+1/(6+8)+…1/(2010+2012)怎么做1/(2+4)+1/(4+6)+1/(6+8)+…1/(2010+2012)怎么做1/(2+4)+1/(4+6)+1/
1/(2+4)+1/(4+6)+1/(6+8)+…1/(2010+2012)怎么做
1/(2+4)+1/(4+6)+1/(6+8)+…1/(2010+2012)怎么做
1/(2+4)+1/(4+6)+1/(6+8)+…1/(2010+2012)怎么做
1/(2*4)+1/(4*6)+1/(6*8)+…1/(2010*2012)
=(1/2-1/4+1/4-1/6+1/6-1/8+……+1/2010-1/2012)÷2
=(1/2-1/2012)÷2
=1005/2012÷2
=1005/4024
1/(2+4)=1/2*(1/2-1/4)
1/(4+6)=1/2*(1/4-1/6)
.......
1/(2010+2012)=1/2*(1/2010-1/2012)
所以1/(2+4)+1/(4+6)+1/(6+8)+…1/(2010+2012)=1/2*(1/2-1/4+1/4-1/6+...+1/2010-1/2012)=1/2*(1/2-1/2012)=1005/4024
=1/2(1-1/2)+1/2(1/2-1/3)+1/2(1/3-1/4)+......+1/2(1/1005-1/1006)
=1/2(1-1/2+1/2-1/3+1/3-1/4+........+1/1005-1/1006)
=1/2(1-1/1006)
=1/2*1005/1006
=1005/2012
-1/2+(-1/6)-(-1/4)-2/3
(2/1-4/1)+(4/1-6/1)+(6/1-8/1)+.+(48/1-50/1)
10,1,8,1,6,2,4,6,2,().
(1/2+1/3+1/4+1/6)*24
-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
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*4)+1/(4*6)+1/(6*8)+.+1/(2008*2010)
1 3/4-5/6-(+1 1/6)-(-1/2)
(1+2/1)(1+4/1)(1+6/1).(1+10/)(1-3/1)(1—5/1).(1-9/1)
1/2+1/(2+4)+1/(2+4+6)+...1/(2+4+6+...2n),求和
1/(2+4)+1/(4+6)+1/(6+8)+…1/(2010+2012)怎么做
探究并计算:1/(2*4)+1/(4*6)+1/(6*8)+…+1/(2006*2008)