1/3+1/6+1/9+1/12+1/15
1/3+1/(3+6)+1/(3+6+9)+1/(3+6+9+12)+1/(3+6+9+12+15)+.1/(3+6+9
3/2+6/1+9/1+12/1+15/1+18/1 怎么简算
简算 2/3+1/6+1/9+1/12+1/15+1/18
2/3+1/6+1/9+1/12+1/15+1/18
1/(1*3) + 1/(3*6) + 1/(6*9) + 1/(9*12) + …+1/(96*99)
2/3 1/6 1/9 1/12 1/15 1/18 哪几个相加等于1
1+3 6/1+5 12/1+7 20/1+9 30/1+11 42/1+13 56/1+15 72/1+17 90/1
1 3 6 9 12 15 18.找规律
2/1 3/1 4/1 5/1 6/1 8/1 10/1 12/1 15/1 20/1
3*6分之1+6*9分之一+9*12分之一+12*15分之一+15*18分之一
(1/2+1/4+1/6+1/8)-(1/3+1/6+1/9+1/12)+(1/4+1/8+1/12+1/16)-(1/
(1/2+1/4+1/6+1/8)-(1/3+1/6+1/9+1/12)+(1/4+1/8+1/12+1/16)-(1/