1+1+2+3+4+5+6=

1+2-3+4-5+6= 1+2+3+4+5-6=? 1+2+3+4+5+6=? 1+2+3+4+5+6= 1+2+3+4+5+6= 1+2+3+4+5+6= 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=1 1/2+2/2+1/2=21/3+2/3+3/3+2/3+1/3=31/4+2/4+3/4+4/4+3/4+2/4+1/4=41/5+2/5+3/5+4/5+5/5+4/5+3/5+2/5+1/5=51/6+2/6+3/6+4/6+5/6+6/6+5/6+4/6+3/6+2/6+1/6=6 2×3/1+3×4/1+4×5/1+5×6/1+.199×200/1=? 1/1*3+1/2*4+1/3*5+1/4*6+.+1/100*102=? -3/4+5/6-1/2-4/3=( ) 1-1/2+1/3-1/4+1/5-1/6+1/7.-1/50=? 1234567654321×(1+2+3+4+5+6+7+6+5+4+3+2+1)=? 2/3+x-1/4=5/6 x-2/7+1/3=5/6 1 2 3 4 5 6=1 怎么算 1 2 3 4 5 6 7 8=1 1+1+2+3+4+5+6+798=几 1+1+2+3-4+5-6×0=?