GRE考試數(shù)學(xué)概念及解析

GRE考試數(shù)學(xué)概念及解析，相信這個(gè)問題是許多正在準(zhǔn)備留學(xué)的同學(xué)關(guān)心的一個(gè)問題，那么下面小編就來和大家說一說，感興趣的您趕緊往下了解吧。

To add two monomials of the same variables just add the coefficients.

Only two like monomials can be added together.

Example:

By adding 3x and 4x, we get (3+4)x=7x.

By adding 3xy+2xy, we get (3+2)xy=5xy.

By adding as and bx, we get ax+bx=(a+b)x.

Remember:

Monomials can be added only if they have the same variables with identical powers.

GRE考試數(shù)學(xué)考點(diǎn)：Algebraic Expression

One or many terms connected by algebraic operations is called an algebraic expression. The operations between the terms must be valid to yield an expression.

Example

(3x+5),(ax2+c),and (xy+a)(x+y) are all algebraic expressions.

(2x+5)+·(3x) is not an expression since + followed by· is not a valid sequence of operations.

Remember

There is no=sign in an expression.

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