第 1 單元，第 1 課

Variables and Expressions代數式

背單字

variable變數
In \(3x + 7\), the variable is \(x\).
constant常數
In \(3x + 7\), the constant is \(7\).
algebraic expression代數式
\(3x + 7\) is an algebraic expression.
term項
\(4x^2 - 7x + 9\) has three terms.
coefficient係數
The coefficient of \(-7x\) is \(-7\).
constant term常數項
In \(2x - 5\), the constant term is \(-5\).
factor因數
In \(5mn\), the factors are \(5\), \(m\) and \(n\).
verbal expression文字敘述
"Six less than a number" is a verbal expression for \(n - 6\).
substitute代入
Substitute \(x = 2\) into \(5x\) to get \(10\).

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