1/2*3+1/3*4+1/4*5+1/5*6+1/6*7+1/7*8+1/8*9+1/9*10+1/10*11(简算)
(1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10+1/11+1/12+1/13+1/14+1/
1/2×4+1/3×5+1/4×6+1/5×7+……+1/8×10+1/9×11
化简:1/1*2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7+1/7*8+1/8*9+1/9*10
1/1+(1/1+2)+(1/1+2+3)……+(1/1+2+3+4+5+6+7+8+9+10+11)=
1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10等于多少?
4/5+[7/8-4/5] 7/10-[2/15+1/6] 1-1/3-1/7 5/6+11/14 5/6-[4/9-1
数列2/1+3/1+4/1+5/1+6/1+7/1+8/1+9/1+10/1+11/1……100/1求和
-1,+1/2,-1/3,+1/4,-1/5,+1/6,-1/7,+1/8,-1/9,+1/10,-1/11,.第30个
1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10+1/11+1/12的整数部分是几,为啥
1+2+3+4+5+6+7+8+9简算
1*2*3+2*3*4+3*4*5+4*5*6+5*6*7+6*7*8+7*8*9+8*9*10+9*10*11+10*
1*3/1+2*4/1+3*5/1+4*6/1+5*7/1+6*8/1+7*9/1+8*10/1+9*11/1+10*1