1/8*9+1/9*10+/110*11+...+/99*100 等于几啊,
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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,
1/8*9+1/9*10+/110*11+...+/99*100 等于几啊,
1/8*9+1/9*10+/110*11+...+/99*100
=(1/8-1/9)+(1/9-1/10)+...+(1/99-1/100)
=1/8-1/9+1/9-1/10+.+1/99-1/100
=1/8-1/100
=23/200;
1/8*9+1/9*10+/110*11+...+/99*100
=(1/8-1/9)+(1/9-1/10)+...+(1/99-1/100)
=1/8-1/9+1/9-1/10+....+1/99-1/100
=1/8-1/100
=23/200;
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,