1/9*10+1/10*11+...+1/59*60
1 +2-3+4+5-6+7+8-9+10+11-12.+58+59-60巧算
1/2+2/3+3/4+4/5+5/6+6/7+7/8+8/9+9/10+10/11+……+58/59+59/60怎么算
坐等 有多少做多少 1-2-3-4+5+6+7-8-9-10+11+12+13-…-56-57-58+59+60+61(
(1/8+1/9+1/10+1/11)*(1/9+1/10+1/11+1/12)-(1/8+1/9+1/10+1/11+
(1/8+1/9+1/+1/10+1/11)*(1/9+1/10+1/11+1/12)-(1/8+1/9+1/10+1/
计算,(1/8+1/9+1/10+1/11)x(1/9+1/10+1/11+1/12)-(1/8+1/9+1/10+1/
(1)8*9/1+9*10/1+10*11/1+.99*100/1
[(8+9+10)/7-(9+10+11)/8+(10+11+12)/9-(11+12+13)/10]/[1/7-1/8
9,10,11,1题怎么做
1,2,3,9,10,11
9*10/1+10*11/1+11*12/1+12*13/1怎么算(简算)
1/9*10+1/10*11+1/11*12+1/12*13.1/100*101=