1+1=1,2+1=1,3+4=1,4+9=1,5+7=1,6+18=1 脑筋脑筋急转弯
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1/2+1/3+1/4=?
1/2-3/1-4/1=
(1-1/2)*(1-1/3)*(1-1/4)*...*(1-1/99)*(1-1/100)=
(1-1/2)+(1/2-1/3)+(1/3-1/4)+.+(1/1999-1/2000)=
巧算:(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+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+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*(1+1/4)*(1-1/4)*(1+1/5)*(1-1/5)=?
1+(1/1+2)+(1/1+2+3)+(1/1+2+3+4)+(1/1+2+3+4+...+100)=?
有理数:-1/2+1/3-(-1/9)-1/4=
1/1*3+1/2*4+...+1/9*11=?
1/1*2+1/2*3+1/3*4+...+1/2000*1/2001=1/1*2+1/2*3+1/3*4+...+1/2000*1/20001=
(1+1/2)(1+1/3)(1+1/4)...(1+1/2009)=
(1-1/2)乘(1-1/3)乘(1-1/4).乘(1-1/2000)=?
1-1/2+1/3-1/4+1/5-1/6+1/7.-1/50=?
2007*(1-1/2)*(1-1/3)*(1-1/4).(1-1/2007)=?
200×(1-1/2)×(1-1/3)×(1-1/4)×……×(1-1/100)=?
1 2 3 4 5=1
1-2/3x=1/4
(x-1/2)/3=1/4