9*10/1+10*11/1+11*12/1+12*13/1怎么算(简算)
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(9+10+11/8-10+11+12/9+11+12+13/10-12+13+14/11)/(1/8-1/9+1/10-1/11)=?
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=
[(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+10-11+12-1?
(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)
9,10,11,12
9 10 11 12
9、10、11、12
9,10,11,12
9 10 11 12
9,10,11,12
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
9,10,11,12题和1,2,3题
11/10*11/10*11/10-11/10*11/10-11/10*1/10简便运算
-1/(10*11)-1/(11*12)-...-1/(99*100)