CalculatorPro vs 全能错题本

Your system calculator says 0.1 + 0.2 = 0.30000000000000004. CalculatorPro doesn't. Arithmetic runs on exact rational numbers, not floating point. 1 ÷ 3 × 3 is 1. 19.99 × 3 is 59.97. Results that must be approximate — trig, logarithms — are marked with ≈, so you always know which numbers you can copy into a contract. — Accurate • Arithmetic, integer powers and decimals: zero error • 1 ÷ 3 shows its repeating digits with an overline, not a string of 333333 • sin(30°) = 0.5 and sin(180°) = 0, not 1.22e-16 • log(100) = 2 (many calculators give you the natural log, 4.605) • 200 + 10% = 220, not 200.1 — Calculates as you type • Live results — no need to press equals • Parentheses, backspace and percent at hand; edit the expression any time • Errors underline the exact fragment at fault and explain in plain language — Nothing gets lost • Every calculation is kept, with full-text search that stays instant across thousands of entries • Notes, pinning, and export to CSV / JSON / Markdown • History stores exact values — reload one in three years and no precision is lost — Two keypads, swipe to switch • Basic: a superset of the system calculator — parentheses, backspace, correct percentages • Scientific: trig, hyperbolics, logs, roots, factorials, modulo, DEG·RAD·GRAD — Also • 20 themes; light and dark are chosen independently, including Blueprint, Terminal, Receipt and Neon • Distinct haptics for digits, operators and equals • Full hardware keyboard mapping; split layout in landscape on iPad • Complete VoiceOver support and Dynamic Type — Privacy No data collected. No account, no network, no analytics. History never leaves your device. No in-app purchases, no subscription, no ads.

错题整理：一键扫描，错题即刻收录，告别手抄，让整理错题变得轻松愉快 智能分类：根据错题的科目、难度、错误类型等自动分类，让复习更有针对性 错题重做：通过反复练习，加强记忆，巩固知识点 作业批改：一键识别作业，提供详细的结果和解析，实现自动化批改 试卷还原：一键将手写试卷转换为电子格式，保持原始布局和内容，可导出重做 --------全能错题本使用场景------- * 到学期末考试知识需要总结，又不知道从何入手？全能错题本持续各学科学霸笔记，节省时间 * 想要重复练习试卷，但试卷已带有笔迹。轻轻一扫，还原空白试卷 * 手抄错题麻烦，轻轻一拍，保存电子版错题本，轻松还原空白题目 * 试卷太多不好整理，每个月总要丢几张？存储到app，试卷不怕丢 【自动续订条款】 高级帐户有四种订购方式可供选择： 连续周会员：只需¥18/周,3天免费试用 连续月会员：只需¥28/月,3天免费试用 连续季会员：只需¥48/季 连续年会员：只需¥168/年 ● 当你确认购买时以及每个续订期开始时, 订阅款项将从你的iTunes账户中扣除 ● 续订：苹果iTunes账户会在到期前24小时内扣费，扣费成功后订阅周期会顺延一个订阅周期。 ● 取消续订：您可通过前往 iTunes 帐户设置并取消订阅的方式，随时取消您的订阅或试用，否则将自动续订。此操作必须在试用期或任何订阅期结束前 24 小时完成以避免被扣费。包含试用期的订阅将自动续订为付费订阅。 ● 当您在试用期内购买高级订阅时，试用期中任何未使用的部分（如提供）将失效。 关于服务条款： http://h5.666sdk.cn/web/wrongpaper/agreement.html 关于隐私政策： http://h5.666sdk.cn/web/wrongpaper/privacy.html ----使用建议---- 为确保你能获得清晰的扫描图，请在拍照时： ● 光线充足，尽量避免抖动 ● 尽量使图片占满拍摄屏幕；