30/1+42/1+56/1=?
30/1+42/1+56/1=?
巧算:1/2+1/6+1/12+1/20+1/30+1/42+1/56=?
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110=?
能简算的要简算 1/30+1/42+1/56+1/72
1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90
1+2/1-6/5+12/7-20/9+30/11-42/13+56/15-72/17=?
42/1+56/1+72/1+90/1+110/1
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90简便运算怎么做
简算:1+12/6+36/12+80/20+150/30+252/42+392/56+576/72
1/2+1/6+1/12+1/30+1/42
1+1∕6+1∕12+1∕20+1∕30+1∕42+1∕56+1∕72
1又1/6+2又1/12+3又1/20+4又1/30+5又1/42+6又1/56+7又1/72 急