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周長 (7分之5×5分之3+7分之5)×2 =(7分之3+7分之5)×2 =7分之8×2 =7分之16 =2又7分之2(米) 面積 7分之5×5分之3×7分之5 =7分之3×7分之5 =49分之15(平方米)
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