应该是（A-B）平方+（C-A）平方-（C-B）平方 吧
∵A+19=B+9=C+8
∴A-B=-10,C-A=11,C-B=1
∴（A-B）平方+（C-A）平方-（C-B）平方=100+121-1=220
络A+19=B+9=C+8,则（A-B）平方+（C-A）平方-（C-A）平方
络A+19=B+9=C+8,则（A-B）平方+（C-A）平方-（C-A）平方
数学人气：678 ℃时间：2019-11-04 08:37:21
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