1+1-2+3-4+5=?
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1+1-2+3-4+5=?1+1-2+3-4+5=?1+1-2+3-4+5=?4
1+1-2+3-4+5=?
1+1-2+3-4+5=?
1+1-2+3-4+5=?
4
1 2 3 4 5=1
1()2()3()4()5=1
1+1-2+3-4+5=?
1+2+3-4-5+1+1+2+3=
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+3-5*4^2-3=
1+2=3 4+5=?
1=5 2=1 5 3=2 1 5 4=3 2 1 5 5=?
|2/1-1|=|5/1-3/1|=|4/3-5/4|=
3+1/2+1/3+1/4+5=?
1+1=?还有1+2+3+4+5=?
1/1*2+1/2*3+1/3*4+1/4*5+.+1/39*40=?
1/1*2+1/2*3+1/3*4+1/4*5+.+1/2004*2005=?
1/1*2+1/2*3+1/3*4+1/4*5+^+1/199*200=?
1+1=?2+2=?3+3=?4+4=?5+5=?
2×3/1+3×4/1+4×5/1+5×6/1+.199×200/1=?
(1+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*(1+1/4)*(1-1/4)*(1+1/5)*(1-1/5)=?
(2*3*4*5)*(1/2+1/3+1/4+1/5)=