3/2-17/6+37/12- 99/20+151

3/2-17/6+37/12- 99/20+151/30-293/42

3个回答

=1+1/1*2-3+1/2*3+3+1/3*4-5+1/4*5+5+1/5*6-7+1/6*7
=1-3+3-5+5-7+1/1*2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7
=-6+1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7
=-5-1/7
=-36/7