2018年GRE数学重要考点（1）

无论什么考试只有掌握了考点，才能达到事半功倍的效果，今天课窝小编就为大家分享GRE数学重要考点，希望同学们都能熟记下来，争取考试中取得高分。

Coefficient

A constant multiplier of a variable is known as coefficient. They are typically represented by letters a,b,c.

Example:

In the expression 3x+5,3 is the coefficient of x.

In the equation 4x+2y=6,4 is the coefficient of x and 2 is the coefficient of y.

In the inequality 2*sin(x)+3>z,2 is the coefficient of the function sin(x).

Remember:

Coefficient cannot change its value.

GRE数学考点介绍：Multiplying Monomials

Multiplying Monomials

To multiply two monomials, multiply the coefficients and add the power of the variables.

By multiplying 3x and 4x, we get (4*3)x∧(1+1)=12x2.

By multiply 3x and 4y, we get (4*3)xy=12xy.

Remember:

Do not forget to add the powers of the same variable.

The terms need not be like terms to be multiplied.

Example:

Number of possible ways to pick 4 oscar nominations from a list of 50 movies is 50!/(4!*(50-4)!)=50!/(4!*46!)=50*49*48*47/24=230300.

Remember:

This does not apply if there are identical objects.

Permutation of Objects

The number of ways n distinct objects can be ordered is n.

Example:

Number of ways 6 people can from a queue is 6.

Number of ways 5 different cars can be parked in 5 parking spaces is 5.

Remember:

This does not apply if there are identical objects or ordering does not matter.

以上就是课窝小编为大家带来的全部内容，都是很实用的内容哦，望考生们认真学习研究下，提高自身的能力，预祝同学们2018年GRE考试取得好成绩。