(長-短)平方=長平方+短平方-2長乘短=4乘邊平方-2X2乘麵積=4X13平方-4X20=196
=》
(長-短)=14
(長-短)平方=長平方+短平方-2長乘短=4乘邊平方-2X2乘麵積=4X13平方-4X20=196
=》
(長-短)=14
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