京东 11.11 红包
8.31 Solving basic linear equations homework 解基本一元一次方程
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8.10 合并同类项、解基础一元一次方程、交叉相乘 Combining like terms, solving basic equations
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8.3 分数裂项求和，解基础一次方程 Telescoping series with fractions, solve basic equations
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Prealgebra lesson 26 解基本线性不等式 Solving basic linear inequalities
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7.15 Mersenne numbers, Fermat primes, twin primes, and factorials 梅森数、费马素数、孪生素数
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6.20 Basic functions, trig identities, complex numbers, and polar coordinates
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7.27 Fractions hw, basic algebra, combining like terms 分数作业、合并同类项、基础代数
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Prealgebra Lesson 31 一元一次方程竞赛题、小数运算
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6.22 Ch 3 Number theory homework 数论基础作业讲解
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7.31 多项式除法Ch6作业、多项式方程的整数解
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4.13 Prealgebra Exponent calculations 指数运算
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7.12 Funky areas of circles 求圆形内部的怪异部分的面积
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4.7 Prealgebra 3.5 LCM 最小公倍数习题讲解
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8.30 圆幂定理、相交弦定理、双割线定理、割线切线定理 The power of a point in a circle
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2.12 Ch 7 The circumcenter, incenter, and angle bisector theorem 外心、内心、角平分线定理
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7.3 The fundamental theorem of algebra, bounds, graphing, and applications
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Prealgebra lesson 4
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7.31 使用多项式的根构造多项式、高次多项式韦达定理作业、高次和差公式习题
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7.10 Divisor problems hw 因数个数、因数求积作业
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7.5 Ch 9 Polygon Challenge Problems Ch 11 Circles 多边形难题讲解、圆
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2.12 Ch 6 Special Right Triangles, Heron's Formula 特殊直角三角形，海伦公式
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7.14 Radical and absolute value functions homework 根式方程和绝对值方程作业
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4.26 Function transformations and inverse 函数图像变换，反函数
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二项式定理竞赛题
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3.31 二次方程竞赛题讲解，单位圆
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9.27 圆的竞赛习题讲解part 4
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5.11 Prealgebra Ch 2 Challenge Problems Ch 3 Dvisibility 整除性
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3.8 Linear equations and inequalities 线性方程与不等式竞赛题讲解
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4.19 Function transformations 方程图像变换，14-16习题选讲
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4.20 Prealgebra 0th and negative exponent 零指数与负指数
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10.1 代数数论习题 Algebra with integers
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3.24 Prealgebra Ch 3习题讲解 Prime factorization, GCD, LCM
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7.10 Rational and irrational roots of polynomials 多项式方程有理数解作业、无理数解讲解
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5.5 Inverse trig, trig identities and equations 反三角函数，三角恒等式及等式
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3.1 线性方程竞赛难题 linear systems challenge problems
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3.5 Ch 7 homework questions 内心外心垂心重心习题讲解
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5.24 Quadrilaterals Challenge Problems 四边形作业讲解（三）Polygons problem solving
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4.14 The unit circle and inverse trig 单位圆解反三角函数
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6.14 Ch 9 Polygon 9.3, 9.4, review questions
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9.13 Circles Homework 圆的竞赛习题讲解
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PreCal 11 Lesson 1 二次方程因式分解、韦达定理 Quadratic factoring and Vieta's formula