1/(9*10)+1/(10*11)+1/(11*12)+.+1/(100*101)怎么算怎么算,一定要简便,5分钟之内.
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1/(9*10)+1/(10*11)+1/(11*12)+.+1/(100*101)怎么算怎么算,一定要简便,5分钟之内.
1/(9*10)+1/(10*11)+1/(11*12)+.+1/(100*101)怎么算
怎么算,一定要简便,5分钟之内.
1/(9*10)+1/(10*11)+1/(11*12)+.+1/(100*101)怎么算怎么算,一定要简便,5分钟之内.
1/(9*10)+1/(10*11)=1/9-1/10+1/10-1/11 以此类推···· 最后就剩1/9-1/101
(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)
(9+10+11/8-10+11+12/9+11+12+13/10-12+13+14/11)/(1/8-1/9+1/10-1/11)=?
[(8+9+10)/7-(9+10+11)/8+(10+11+12)/9-(11+12+13)/10]/[1/7-1/8+1/9-1/10]
1,2,3,9,10,11
1又 9/20-11/10
9,10,11,1题怎么做
11分之9-11分之9×10分之1简算
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=
11/10*11/10*11/10-11/10*11/10-11/10*1/10简便运算
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
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+10-11+12-1?
计算:1/9*10+1/10*11+1/11*12+1/12*13+1/13*14+1/14*15+1/15*16+1/16*17+1/17*18 提示:1/9-1/10=1/9*10
10 98 10 112 102 977 9 9 101的平均数是多少