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<!DOCTYPE html> <html lang="zh-Hant"> <head> <meta charset="UTF-8"> <title>四期現金流量 IRR 計算與圖形化</title> <style> .container { background-color: white; padding: 20px; border-radius: 8px; box-shadow: 0 2px 10px rgba(0,0,0,0.1); } .input-group { margin-bottom: 15px; display: flex; justify-content: space-between; align-items: center; } input { padding: 8px; width: 200px; border: 1px solid #ccc; border-radius: 4px; text-align: right; } button { background-color: #007bff; color: white; border: none; padding: 10px 20px; border-radius: 4px; cursor: pointer; width: 100%; font-size: 16px; } button:hover { background-color: #0056b3; } .result { margin-top: 20px; font-weight: bold; font-size: 18px; color: #333; } canvas {...