JPWeb vs Linear Algebra

主要功能： （以下所有功能支持 7 天免费试用，试用结束后需订阅使用） 1. 内置日语网站：精选多个常用的日语网站，如Yahoo新闻、NHK新闻等。 2. 自定义添加：添加和管理您喜欢的日语网站。 3. 假名标注：自动为日语汉字添加假名标注，帮助理解生词。 4. 中文翻译：可选择开启中文翻译功能，辅助阅读理解。 5. 日语阅读：支持日语文章的朗读与高亮显示功能。 6. 浏览器功能：支持前进、后退、缩放等标准浏览器功能。 订阅说明： 　试用期结束后，您需要订阅 JPWeb 月度会员（¥3/月） 以继续使用上述功能。 　订阅将在免费试用结束后自动续订，费用将通过您的 Apple ID 账户扣款。 用户可以在“订阅管理”中随时取消订阅（注意：需在当前订阅周期结束前至少 24 小时取消，否则订阅将自动续期）。 此应用受标准苹果EULA（苹果公司最终用户许可协议）约束 : https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Linear Algebra turns any matrix problem into a teacher-style, step-by-step solution: what each step does, why it works, plus the final answer, a back-substitution check and exam tips. Free to download – every tool works and final answers are always free. Note: the app interface and step-by-step explanations are in Simplified Chinese. Matrices, formulas and answers are standard math notation. 39 SOLVER TOOLS • Exam essentials one tap away: determinant, inverse matrix, systems of linear equations, rank, eigenvalues & eigenvectors, diagonalization, quadratic form to canonical form, reduced row echelon form (RREF). • Organized by chapter: determinants & matrix operations, elementary row operations & rank, linear systems, vector sets, eigenvalues & quadratic forms, polynomials. • Advanced matrix theory: Jordan normal form, singular value decomposition (SVD), LU decomposition, Smith normal form, full-rank factorization, Moore–Penrose pseudoinverse, least squares, matrix norms and more. STEP-BY-STEP, LIKE A TEACHER • Every elementary row operation comes with an explanation, not just a wall of matrices. • Linear systems get the complete general solution (particular solution + basis of the null space); eigenvalue problems list all eigenvectors; diagonalization gives P and Λ. • The answer card sits on top, with automatic back-substitution checks and notes on common exam points and pitfalls. STUDY CARDS 39 topics organized as key formulas → solving method → worked example → typical exam questions → common mistakes, each tagged by how often it appears on exams. Jump from any card straight into the solver to try a problem. FREE AND FULL VERSION • Free: all tools, final answers always free, 3 full step-by-step solutions per day. • Full version (one-time purchase, not a subscription): unlimited access to every step and explanation, available on all your devices signed in with the same Apple ID, with Restore Purchases. RUNS ON YOUR DEVICE Problems are solved locally on your iPhone. Nothing is uploaded, and it works offline. PRIVACY & SUPPORT Privacy policy, FAQ and contact email are on the Support URL page below.