诗词之美 vs MathBench

西窗烛是一款弘扬中华优秀传统文化的古诗词应用，提供唐诗、宋词、古文、典籍、绘画、写字、原创、朗诵等诗词学习工具和创作社区。西窗烛的诞生旨在建立诗词与用户、传统与现代、价值与传承的沟通桥梁，让用户可以更便捷、更全面、更自由地触达到中华优秀传统文化领域。 ▣ 西窗愿景 「西窗烛」愿成为一扇「窗」，窗的一边是中国传统文化之美，另一边，是大家。古典文化，现代传承。 ▣ 功能亮点 【诗词文库】百万诗词文库，按朝代、作者、作品分类搜索，诗词内容涵盖作者简介、赏析、注释 、译文、题解、题注、序、段意、校记、笺注、评笺、按语、评析、短评、述评、选评、解评、编年、附录、辑评、集评、汇评等。 【诗词分类】精选分类包括：选集、主题、写景、节日、节气、词牌、时令、用典、地理、名山、城市、时间、花卉、课本等数百个分类。 【诗词搜索】按朝代进行精准搜索：商、周、秦、汉、三国、晋、南北朝、隋、唐、五代、辽、宋、金、元、明、清等。按作者进行搜索：孔子、老子、孟子、庄子、苏轼、李白、陆游、王维、杜甫、杜牧、屈原、柳永、李煜、李商隐、辛弃疾、李清照、白居易、陶渊明、温庭筠、欧阳修、晏几道、刘禹锡、孟浩然等。 【诗词选集】唐诗三百首、宋词三百首、元曲三百首、诗经、乐府、千家诗、古诗十九首、道德经、周易、论语、茶经、红楼梦、三国演义、水浒传、西游记、四时幽赏、随园食单、声律启蒙、笠翁对韵等。 【词典搜素】查字查词释义，以《辞海》《汉语大词典》等为核心内容，涵盖汉字知识库、汉语语词知识库、汉英双语知识库、综合百科知识库、历史纪年、古今地名库、诗文库等。 【音频朗读】百万诗词文音频朗读，诗词、诗单、学习计划、文库分类、作者分类、作品收藏页支持一键播放音频。 【电子书籍】中国文鉴赏辞典系列：包括《唐诗鉴赏辞典》《宋诗鉴赏辞典》《古文鉴赏辞典》《唐宋词鉴赏辞典》《二十四史鉴赏辞典》等。 【诗词图库】诗中有图，图中有诗。 【学习计划】把诗词选集、文库分类和诗单收藏设置成为自己的学习计划，每天有计划的打卡学习。 【名句日赏】在百万文库基础上的一日一赏和诗词卡片，指尖划过片笺片玉，诗词之美熨帖心肺。 【卡片创作】创意的卡片式左右翻阅，卡片内容可自由创作，支持简繁和字体切换，保存浏览记录。 【练字模式】摘录页、诗词页可以切换到练字模式，体验临摹、练字的场景，提供丰富的字体和样式。 【诗词游戏】诗词大会、飞花令和诗词接龙，诗词在富有趣味性和竞技性的游戏过程中焕发新的魅力。 【诗单、词单】像歌单一样可以创建诗单、收藏诗单，添加你喜欢的诗词到诗单，珍藏一份诗意。 【丰富字体】提供楷书、行书、篆书、隶书、草书、刻本、毛笔、宋体、仿宋、创意等几十种古风字体。 # 诗词会员 诗词会员是一项可选的付费订阅功能，为用户提供一系列会员专属功能，包括：更多分享模板、会员专属字体、会员标识、下载原图等。 该服务目前提供 6 元/月的按月订阅服务和 50 元/年的按年订阅服务，两者均提供 7 天试用，试用以后将无法取消当期订阅。 会员服务自动续费时间为离到期时间的 24 小时之内；若您打算取消订阅，可在到期时间 24 小时前取消，则订阅不会自动续费。 该服务默认将自动续订，您可以通过：iPhone 系统设置 -> 个人账户 -> iTunes Store 与 App Store -> Apple ID -> 查看 Apple ID -> 订阅，在其中取消订阅。 隐私策略：http://site.xczim.com/shici-privacy 使用条款：http://site.xczim.com/shici-terms ▣ 联系我们 意见反馈：hi@xcz.im 官方微信客服：xcz_im QQ 交流群：8764179 官方微信：西窗烛App 官方微博：西窗烛App 「西窗文化」荣誉出品。

MathBench turns math into hands-on reasoning. Do the same thing to both sides of a balance until only x remains. Drag parameters until a parabola passes through the target. Bisect an angle with only a compass and straightedge. Every move is checked for equivalence in real time. THREE SUBJECTS, 75 LEVELS Algebra Balance: linear equations, systems, quadratics and inequalities. Multiply by a negative and the sign must flip; divide by an expression in x and you may lose a root. Brainer levels are built around these traps. Graphs: linear, quadratic, inverse and absolute-value functions, shifts and stretches, and solving equations and inequalities by graph. Constructions: perpendicular bisectors, angle bisectors, perpendiculars, parallels, regular hexagons, circumcenter and incenter, tangents to a circle. Each subject has Intro, Core, Brainer and Mixed levels. 30 levels are playable right away; the other 45 unlock with Pro. A daily challenge and a review list bring back levels you solved with help. PRINCIPLE CARDS After each solve, a Principle Card explains why it works using the numbers from your own solve, such as x = (3 ± √17)/4 or 3² + 4² = 25. FIVE TOOLS • Exact fractions: simplify, common denominators, mixed numbers, repeating decimals, prime factorization • Equations: linear and quadratic with exact radicals, inequality intervals, 2×2 and 3×3 linear systems • Graphing: up to three curves with zeros, intersections and vertices • Triangle solver: find the remaining sides, angles and area, including the two-solution case • Statistics: mean, median, mode, range, quartiles, variance and standard deviation, computed exactly as fractions from integers, decimals or fractions Tool results are unlimited; hints are never consumed and undo is unlimited. PRO — ONE-TIME PURCHASE All 75 levels, full Principle Card derivations, step-by-step tool working, and a Free Bench you can edit and save (balance, graph and construction benches). Pro includes every worked answer and all Pro features. The first three fixed sample answers in each subject are free to view; all remaining answers unlock with Pro. One-time purchase. No subscription. PRIVACY All calculations run on your device and work offline. No account and no analytics SDK. Progress syncs through your own private iCloud. NOTE: MathBench is for understanding principles and practicing reasoning. Problems are original, not tied to any textbook, and no exam-score gains are promised. Support, Privacy Policy and Terms of Use are in Settings.