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小 A 有两块球形橡皮泥，一个半径是 4，一个半径是 10。他想把这两块橡皮泥揉在一起，然后塑造成一个正方体，请问这个正方体的边长是多少？ 若结果非整数，则舍去小数点后的数字。取 π=3.141593。