42/1 + 56/1 +72/1 + 90/1 + 110/1 + 132/1=?错了，是1/42+1/56+1/72+1/90+1/110+1/132

来源：学生作业帮助网 编辑：作业帮 时间：2024/05/03 05:59:43
42/1 + 56/1 +72/1 + 90/1 + 110/1 + 132/1=?错了，是1/42+1/56+1/72+1/90+1/110+1/132

42/1 + 56/1 +72/1 + 90/1 + 110/1 + 132/1=?错了，是1/42+1/56+1/72+1/90+1/110+1/132
42/1 + 56/1 +72/1 + 90/1 + 110/1 + 132/1=?
错了，是1/42+1/56+1/72+1/90+1/110+1/132

42/1 + 56/1 +72/1 + 90/1 + 110/1 + 132/1=?错了，是1/42+1/56+1/72+1/90+1/110+1/132
1/42=1/(6*7)=1/6-1/7
1/56=1/(7*8)=1/7-1/8
1/72=1/8-1/9
.
1/132=1/11-1/12
1/42+1/56+1/72+1/90+1/110+1/132=1/6-1/12=1/12

1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10+1/10-1/11+1/11-1/12=1/6-1/12=1/12

90+110=200
42+72+56=44+56+70=170
最后得200+170+132=502

1/42+1/56+1/72+1/90+1/110 1/30+1/42+1/56+1/72+1/90 1/42+1/56+1/72+1/90+1/110 1/30+1/42+1/56+1/72+1/90 1－1/6 +1/42 +1/56 +1/72 1-1/6＋1/42+1/56+1/72 1/42+1/56+1/72+1/90+1/110 1/30+1/42+1/56+1/72 简算 1/30+1/42+1/56+1/72简便算法 1/30+1/42+1/56+1/72＝ 简算1/30+1/42+1/56+1/72＝? 1/30+1/42+1/56+1/72= 30分之1+42分之一+56分之1+72分之一 42/1 + 56/1 +72/1 + 90/1 + 110/1 + 132/1=?错了，是1/42+1/56+1/72+1/90+1/110+1/132 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72 1/12+1/20+1/30+1/42+1/56+1/72+1/90 1/12+1/20+1/30+1/42+1/56+1/72+1/90