一个天平，砝码分别为1g、3g、9g、27g、6561g，每个砝码只有一个，要称重的物品放在天平的左侧，而砝码允许放在天平的左右两侧。已知一个物品的重量，问如何称重？试编程解决。-A balance, weights were 1g, 3g, 9g, 27g, 6561g, each weight is only one item on the scale to weigh the left, while the weight allowed on both sides of the bala