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About | Khan Academy
Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a free, world-class education for anyone, anywhere.
2024年4月25日
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Algebra: Linear equations 1 | Linear equations | Algebra I | Khan Academy
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Algebra: Linear equations 1 | Linear equations | Algebra I | Khan Academy
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Introduction to solving an equation with variables on both sides | Algebra I | Khan Academy
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Introduction to solving an equation with variables on both sides | Algebra I | Khan Academy
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Introduction to the quadratic equation | Quadratic equations | Algebra I | Khan Academy
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Introduction to the quadratic equation | Quadratic equations | Algebra I | Khan Academy
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Ever heard (or felt) “I’m just not a math person”? Try practicing on Khan Academy: instant feedback, no judgement, a variety of questions, and hints along the way. Give it a try! 👉 khan.co/mathonkhan | Khan Academy
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Ever heard (or felt) “I’m just not a math person”? Try practicing on Khan Academy: instant feedback, no judgement, a variety of questions, and hints along the way. Give it a try! 👉 khan.co/mathonkhan | Khan Academy
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已浏览 1.7万 次2018年4月25日
Khan Academy Science
Introduction to electrolysis | Redox reactions and electrochemistry | Chemistry | Khan Academy
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Introduction to chemistry | Atoms, compounds, and ions | Chemistry | Khan Academy
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Introduction to chemistry | Atoms, compounds, and ions | Chemistry | Khan Academy
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Mass spectrometry | Atomic structure and properties | AP Chemistry | Khan Academy
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Ever heard (or felt) “I’m just not a math person”? Try practicing on Khan Academy: instant feedback, no judgement, a variety of questions, and hints along the way. Give it a try! 👉 khan.co/mathonkhan | Khan Academy
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Ever heard (or felt) “I’m just not a math person”? Try practicing on …
已浏览 1.7万 次2018年4月25日
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We’re excited to announce that studying for the SAT for 20 hours on Khan Academy’s free Official SAT Practice is associated with an average score gain of 115 points. That’s nearly double the average score gain compared to students who don’t use our free test prep. Start studying today! http://khan.co/SATStudyonKA | Khan Academy
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We’re excited to announce that studying for the SAT for 20 hours …
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"It's amazing, and it's free. It's free!" – LaToya Grubbs, middle school teacher, Georgia. Join Khan Academy today to help every student succeed with personalized practice. | Khan Academy
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"It's amazing, and it's free. It's free!" – LaToya Grubbs, middle school t…
已浏览 6.2万 次2019年2月27日
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Khan Academy Goes Way Beyond Math: New Courses Launch for 2024 School Year in STEM, Humanities, Computer Science, and More
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2024年8月6日
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Calling all teachers! 🧒📣Khan Academy offers K-14 standards-aligned content in math, science, history, art and more. We have 50,000 practice problems for remediation and enrichment. Free for teachers and students!📣 | Khan Academy
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Calling all teachers! 🧒📣Khan Academy offers K-14 standards-aligned con…
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"One of the tools that I choose to use because I believe in the curric…
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Keep your kids learning over the holidays with Khan Academy Kids…
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