def reconstruct_formula(formula, wb_v, sheet_name):
    """수식 내 셀 주소를 실제 값으로 치환 및 기호 가독화"""
    if not formula or not str(formula).startswith('='): return str(formula)
    ref_pattern = r"(?:'([^']+)'|([a-zA-Z0-9가-힣]+))?!([A-Z]+\d+)|([A-Z]+\d+)"
    
    def replace_with_value(match):
        s_name = match.group(1) or match.group(2) or sheet_name
        coord = match.group(3) or match.group(4)
        try:
            val = wb_v[s_name][coord].value
            if val is None: return "0"