固定资产折旧-双倍余额递减法

def solve(____):
    rate = ____ / useful_life
    book_value = cost
    for y in range(____, year + ____):
        if y <= useful_life - ____:
            depreciation = book_value * rate
            book_value -= depreciation
        else:
            depreciation = (____) / (____)
            book_value -= depreciation
    return {"____".format(____): round(____)}