简算题 3/2+15/2+35/2+63/2+99/2+143/2=?
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简算题 3/2+15/2+35/2+63/2+99/2+143/2=?
简算题 3/2+15/2+35/2+63/2+99/2+143/2=?
简算题 3/2+15/2+35/2+63/2+99/2+143/2=?
3/2+15/2+35/2+63/2+99/2+143/2
=1-3/1+3/1-5/1+5/1-7/1+7/1-9/1+9/1-11/1+11/1-13/1
=1-13/1
=13/12
108
179
3/2+15/2+35/2+63/2+99/2+143/2=(15+35+3+63+99+143)/2=358/2=179
179啊
=(3+143)/2+(15+99)/2+(35+63)/2
=146/2+114/2+98/2
=73+57+49
=179