跳转到 Khan Academy 9th Grade Math 的关键时刻

9:15
起始时间 00:01Introduction to Quadratic Equations
Introduction to the quadratic equation | Quadratic equations | Algebra I | Khan …
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6:55
起始时间 0:00Introduction to Arithmetic
What are variables, expressions, and equations? | Introduction to algebra | …
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9:50
起始时间 00:01Introduction to Adding and Subtracting Fractions
Adding and subtracting fractions | Fractions | Pre-Algebra | Khan Academy
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9:21
起始时间 0:00Introduction to Solving Linear Systems
Solving linear systems by substitution | Algebra Basics | Khan Academy
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12:44
起始时间 0:00Introduction to Solving Equations
Solving systems of equations by elimination | Algebra Basics | Khan Ac…
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8:53
起始时间 0:00Introduction to Solving Equations
Introduction to solving an equation with variables on both sides | Algebra I | Kh…
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5:54
起始时间 0:00Introduction to Rational Numbers
Introduction to rational and irrational numbers | Algebra I | Khan Academy
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7:28
起始时间 00:01Introduction to Linear Equations
Algebra: Linear equations 1 | Linear equations | Algebra I | Khan Academy
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6:04
起始时间 00:01Introduction to Linear Equations
Solving equations with the distributive property | Linear equations | Algebra I …
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2:36
起始时间 0:00Introduction to Simplifying Expressions
Exponent properties 1 | Exponent expressions and equations | Algebra I …
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