2.有关集合:
Union 并集
proper subset 真子集
solution set 解集
3.有关代数式、方程和不等式:
algebraic term 代数项
like terms,similar terms 同类项
numerical coefficient 数字系数
literal coefficient 字母系数
inequality 不等式
triangle inequality 三角不等式
range 值域
original equation 原方程
equivalent equation 同解方程 等价方程
linear equation 线性方程(e.g.5x+6=22)
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