今天來談談"Algebra"(代數), 你必須先認識以下6個專有名詞喔!!!SAT MATH. 中的數學沒那麼難, 但你就是要了解每個專有名詞!
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Constant.
A quantity that does not change. A number.
Variable.
An unknown quantity written as a letter. A variable can be represented by any letter in the English alphabet, most often x or y. Variables may be associated with specific things, like x number of apples or y dollars. Other times, variables have no specific association, but you’ll need to manipulate them to show that you understand certain algebraic principles.
Coefficient 係數
A coefficient is a number that appears next to a variable and tells how many of the variable there are. In the term 4x, 4 is the coefficient.
Equation 方程式 
Two expressions linked by an equal sign. Most of the algebra on the SAT consists of solving equations.
Term 項
The product of a constant and a variable. Or, a quantity separated from other quantities by addition or subtraction. For example, in the equation
the side to the left of the equal sign contains four terms {3x3, 2x2, –7x, 4}, while the right side contains two terms {x, –1}. (The constants, 4 and –1, are considered terms because they are coefficients of variables raised to the zero power: 4 = 4x0.) So every term, including constants, is the product of a constant and a variable raised to some power.
Expression 式/符號 
Any combination of terms. An expression can be as simple as a single constant term, like 5, or as complicated as the sum or difference of many terms, each of which is a combination of constants and variables, such as {(x2 + 2)3 – 6x} ⁄ 7x5. Expressions don’t include an equal sign—this is what differentiates expressions from equations. Expressions cannot be solved; they can only be simplified.

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