1/8*9+1/9*10+/110*11+...+/99*100 等于几啊,

1/8*9+1/9*10+/110*11+...+/99*100 等于几啊, [(8+9+10)/7-(9+10+11)/8+(10+11+12)/9-(11+12+13)/10]/[1/7-1/8+1/9-1/10] (9+10+11/8-10+11+12/9+11+12+13/10-12+13+14/11)/(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+1/11+1/12)*(1/9+1/10+1/11) 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+1/11+1/12)x(1/9+1/10+1/11) (1/8+1/9+1/10+1/11)X(1/9+1/10+1/11+1/12)-(1/8+1/9+1/10+1/11+1/12)X(1/9+1/10+1/11) x-1/3-8/9=110 1/8*9+1/9*10+1/10*11+.1/99*100 8*1/9+9*1/10+10*1/11+...+99*1/100=? 1/11+2/22+3/33+4/44+5/55+6/66+7/77+8/88+9/99-10/100+11/110+12/120/13/130= 等于多少用简便运算,如（1/8+1/9+1/10+1/11）×（1/9+1/10+1/11+1/12）-（1/8+1/9+1/10+1/11+1/12）×（1/9+1/10+1/11）=(1/9+1/10+1/11)x(1/9+1/10+1/11+1/12-1/8-1/9-1/10-1/11-1/12)+1/8x(1/9+1/10+1/11+1/12)=1/8x(1/9+1/10+1/11+1/12-1/9-1/10-1 10 98 10 112 102 977 9 9 101的平均数是多少 10'' 98 10 112 102 977 9 9 101时间的平均数是多少 找规律10,1,9,6,8,11,7, 1、2、4、8、9、10、11求通式 8/1×11/9＋11/9÷8要简算 按从小到大的顺序排序：111%,9分之10,101.01%,1又8分之1,110% 8,9,10,11,