1 2 3 4 5 =1 , 1 2 3 4 5 6=1 , 1 2 3 4 5 6 7 8=1 如何做?3道题

1+2+3-4-5+1+1+2+3= 1 2 3 4 5=1 1()2()3()4()5=1 1+1-2+3-4+5=? 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= 3+1/2+1/3+1/4+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=? 1/2+1/(2+3)+1/(2+3+4)+.+1/(2+4+5+...)200)=? 1+2=3 4+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=?还有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|= (2*3*4*5)*(1/2+1/3+1/4+1/5)= 5+2+0+1+3+1+4=2+5+0+1+3+1+4