1,4/3-7/12+9/20-11/30+13/42-15/56+17/72-19/90
2,42/[（2/3+0.4）*60/（131/42-33/14）]
3,7/3*4+7/4*5+7/5*6+7/6*7
4,1-1/2-1/6-1/12-1/20-1/30
5,1+1/2+1/6+1/12+1/20+1/30
够吗?不够还有! 1,4/3-7/12+9/20-11/30+13/42-15/56+17/72-19/90
2,42/[（2/3+0.4）*60/（131/42-33/14）]
3,7/3*4+7/4*5+7/5*6+7/6*7
4,1-1/2-1/6-1/12-1/20-1/30
5,1+1/2+1/6+1/12+1/20+1/30
够吗?不够还有!