About TOEFL Blue Delta, TOEFL Blueprint DELTA Listening Level

I've taken the test once, and in general, the questions of delta are still a bit simple, if you understand the front of the words in it, it doesn't mean that you can understand it all during the exam, because the questions of the exam are likely to be tested in aspects or subject areas that you have never been involved in, but at the level that you can fully understand delta, it must be no problem to understand during the exam Anyone will miss the words when they take the test, but the impact is very small, mainly pay attention to the tone and tone of the listening, if there are really words that you can't understand, That will help you guess what it means.

Practical experience: Yes, but it does not affect the answer, of course, you have to memorize the words.

If you can make sure that you understand every word of all the paragraphs in it, there should be basically no new words in the exam.

Delta is actually very watery. It's better to practice with barron if you have the chance. In fact, TOEFL, except for you to study the [Orange Treasure Book], otherwise you will definitely encounter words that you don't know when you take the exam, but at the same time, these too professional words are something he won't test.

Actually, I think the better way is to dictate, it's Ma Jun's method, go and see. Of course, you can also choose to laugh at the teacher's reading + memorization method, which is actually more useful than just listening to delta.

The key is not how many words you don't understand, but how many questions you get right.

If you don't understand individual words, it will not affect the question.

If only you could achieve what you said you would have enough vocabulary.

The delta difficulty is basically the same as the real question, maybe the real question is 10, delta yes, you understand it so.

Delta's essays are about the same as the past papers, and the pace of speech is about the same.

The gap lies in the difficulty of the question

delta is the name of the Greek letter δ, which is the discriminant expression of the root of a quadratic equation.

An integral equation that contains only one unknown (unary) and the highest order of the unknown term is 2 (quadratic) is called a quadratic equation. The standard form is: ax + bx + c = 0 (a≠0).

A quadratic equation must satisfy three conditions at the same time:

is an integer equation, that is, there are integers on both sides of the equal sign, and if there is a denominator in the equation; And the unknown number is on the denominator, then this equation is a fractional equation, not a one-dimensional quadratic equation, if there is a root number in the equation, and the unknown number is in the root number, then this equation is not a one-element quadratic equation (it is an irrational equation).

Contains only one unknown;

The highest number of unknowns is 2.

The methods for finding the root of a quadratic equation are:

1.Direct leveling method.

A quadratic equation of the form x = p or (nx+m) = p (p 0) can be solved by the direct open-flat method. If p is very large, you can use the pen calculation method to open the square.

2.Matching method.

Steps to solve a quadratic equation with the fitting method:

Reducing the original equation to a general form;

Divide both sides of the equation by the quadratic coefficient to make the quadratic coefficient 1, and move the constant term to the right of the equation;

Add half of the square of the coefficient of the primary term to both sides of the equation;

The left side is matched into a perfectly flat method, and the right side is turned into a constant;

Further, the solution of the equation is obtained by the direct open-level method, and if the right side is a non-negative number, the equation has two real roots; If the right side is a negative number, then the equation has a pair of conjugate imaginary roots.

3.Formula method.

The general steps to solve a quadratic equation using the root finding formula method are:

Formulate the equation into a general form and determine the values of a, b, and c (note the symbols);

Find the value of the discriminant δ and judge the condition of the root;

Under the premise that the δ is greater than or equal to 0, the values of a, b, and c are substituted into the formula to calculate, and the root of the equation is obtained. The formula for finding the root of a quadratic equation is applicable when the coefficients of the equation are rational, real, complex, or arbitrary. If δ=0, the equation has two equal real roots, and if the δ is less than zero, there are no real roots.

4.Factorization.

Factoring is a method of using factorization to find the solution of an equation.

The general steps of factoring to solve a quadratic equation by factorization:

Shift the term so that the right side of the equation is zeroed;

converts the left side of the equation into the product of two unary linear equations;

Let each factor be zero.

Find the roots of two unary equations, and their roots are the roots of the original equations.

I hope I can help you with your doubts.