巧算:2/1-6/1-12/1-20/1-30/1-42/1-56/1-72/1
巧算:2/1-6/1-12/1-20/1-30/1-42/1-56/1-72/1
巧算:1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72
巧算1道数学题1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=?
巧算1/6 1/12 1/20 1/30 1/42 1/56
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+.1/9900
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/10
1-(1/2)+(1/6)+(1/12)+(1/20)+(1/30)+(1/42)+(1/56)+(1/72)+(1/9
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110
谁能巧算1-1/2-1/6-1/12-1/20-1/30-1/42-1/56-1/72-1/90
2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1+90/1等于多少
1.计算:1 - 1/2 - 1/6- 1/12 - 1/20 - 1/30 - 1/42 - 1/56 - 1/72