1/2+(1/4+3/4)+(1/6+3/6+5/6)+······+(1/98+3/98+···+97/98)=?
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1/2+(1/4+3/4)+(1/6+3/6+5/6)+······+(1/98+3/98+···+97/98)=?1/2+(1/4+3/4)+(1/6+3/6+5/6)+······+(1/98+3
1/2+(1/4+3/4)+(1/6+3/6+5/6)+······+(1/98+3/98+···+97/98)=?
1/2+(1/4+3/4)+(1/6+3/6+5/6)+······+(1/98+3/98+···+97/98)=?
1/2+(1/4+3/4)+(1/6+3/6+5/6)+······+(1/98+3/98+···+97/98)=?
1/2+(1/4+3/4)+(1/6+3/6+5/6)……+(1/98+3/98+……+97/98)
=1/2+1+3/2+2+5/2+...+49/2
=(1/2)*(1+2+3+...+49)
=(1/2)*(1+49)*49/2
=1225/2
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+(-1/6)-(-1/4)-2/3
(1/2+1/3+1/4+1/6)*24
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)=
计算((1/3)^2)×4^0+((1/3)^4)×4^1+((1/3)^6)×4^2+…+((1/3)^2n)×4^(n-1)
2(3^2+1)(3^4+1)(3^6+1)(3^8+1)要简算
2/3,1,6/5,4/3,( ),3/2
1/6【1/4{1/3(1/2X-1)+3}+5】=1
1/2*1/3+1/3*1/4+1/4*1/5+1/5*1/6 (简便方法)
1/(1*3)+1/(2*4)+1/(3*5)+1/(4*6)+...+1/(8*10)=?
2/9除以【(1/2+1/6)*3/4】
(-1/4)+5/6+2/3-1/2
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、2、4、3、6、4、( )、(
1/(1×2×3)+1/(2×3×4)+1/(4×5×6)、、、、+1/(48×49×50)
(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)