(长-短)平方=长平方+短平方-2长乘短=4乘边平方-2X2乘面积=4X13平方-4X20=196
=》
(长-短)=14
(长-短)平方=长平方+短平方-2长乘短=4乘边平方-2X2乘面积=4X13平方-4X20=196
=》
(长-短)=14
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