1/12+1/15+1/10

1/12+1/15+1/10 1÷（1/10+1/15+1/12） 1+10+11+12+13+14+15 1/10*11+1/11*12+1/12*13+1/13*14+1/14*15等于? (1/10+1/12+1/15)*(6-x)+(1/12+1/15)*x=1怎么解啊! (1/10+1/12+1/15)*(6-x)+(1/12+1/15)*x=1怎么解有分加 2/1 3/1 4/1 5/1 6/1 8/1 10/1 12/1 15/1 20/1 (1/2+1/4+1/6+1/10+1/12+1/60)/(1+1/3+1/5+1/10+1/15+1/30) 2/15-1/12 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 1/6:X=15/12:3/10X*3/10=15/12*1/6为什么要这么做X*1/6=3/10*15/12 (1+1/3+1/5+1/10+1/15+1/30)/(1/2+1/4+1/6+1/12+1/20+1/60)(用简算) (1+1/3+1/5+1/10+1/15+1/30)/(1/2+1/4+1/6+1/12+1/20+1/60)=​?简便计算方法 (1+1/3+1/5+1/10+1/15+1/30)/(1/2+1/4+1/6+1/12+1/20+1/60)=​?简算 1/10x+(1/12+1/15)×(7-x)=1 怎么算 12:40,12:45,12:50,1:10,1:110,1:15,1:20用英语怎么说 1/10*11+1/11*12+1/12*13+1/13*14+1/14*15等于?我看不懂 这道题怎么简算 10/9-(12/1+15/2)