Line test -- data analysis -- FB -- teacher Gao Zhao

Self learning method

        Handouts are used to preview , Take notes carefully , Textbooks are used to strengthen the framework .

Examination situation and examination affairs

Examination situation and examination affairs

         Topic quantity 4 piece *5 Avenue =20 Avenue

         Question type The problem is standardized , Little deformation

Preparation strategy

        Summary routine , Increase speed ;

        Pay attention to details , Ensure accuracy ;

        Focus on practice , Practice makes perfect ;

        Take it all , The module most likely to get full marks .

Curriculum

One 、 Quick calculation skills 、 Find the number quickly 、 Base period and current period

Two 、 General growth rate 、 Growth

3、 ... and 、 Proportional correlation 【 The proportion of 、 The average 、 Multiple 】

Four 、 Special growth rate 、 other

One 、 Quick calculation skills

1. Preliminary knowledge

        If you can figure out the answer at a glance , If not, take a pen to estimate . Try to write as few formulas as possible, and the calculation is slow .

        The purpose of estimation is to exclude options .

Add ： High position 、 Low quantile calculation .  Like three digits 692 + 516 , You can calculate the upper two digits first

        692+516 = 1208 The first two figures are calculated together , Calculate the next digit . If a bit has a carry , Then add it to the high position .

 

Subtraction ： Dash subtract

（1） Take the middle integer value . such as 523-488 It can be calculated as follows

        523-488 = 23+12=35 This is to take an intermediate value .

（2） Underline . On the premise of not borrowing and subtracting . It can be two digits in front or mantissa in the back

        926-532 The second one needs to borrow So the first two draw together .92-53 = 39 You subtract 4, So the end result is 394;

        692-516 The last two borrow . therefore 92-16=76 first place 6-5 yes 1 So the final 176.

  Multiplication ： It is also quantile calculation . It is also a high-order calculation , Calculate again .

Tips ： Multiplicative distribution rate

（1）a*1.1 = a*(1+0.1) 

（2）a*0.9=a*（1-0.1）

division ： Option numbers are brought into quotient , Then multiply and divide , See whether the results meet the requirements . According to the option puzzle item, we probably know that the quotient is 5, that 5*127, Then use the multiplicative high order calculation . Never calculate and divide step by step from low to high , Too slow .

Real quick calculation must be based on options , Do exclusion . Options are the biggest skill in data analysis .

2. Intercept division

        effect ： Used to calculate division .

What is intercept ？

        Truncation is not a removed bit , Is the number of digits left . In fact, the name of division by bits is more accurate .

Cut division steps 【 Self knot 】

        effect ： Used to calculate division 、 fraction

（1） A few steps of division . Decide whether to truncate or denominator . One step division truncates the denominator , Multi step division truncates numerator and denominator .

        Only numerator and denominator , The numerator and denominator are considered as one-step division even if they are arithmetic expressions .

        If multiple fractions are divided , Then it's multi-step division .

（2） Size of option gap . Decide how many people to cut .【 Look at the first 、 The order determines the size of the gap . Gap is big 2 position , Small gap 3 position .】

        The first option is different 、 The second bit difference of the options with the same first but the closest size is greater than the first digit 、 There is an approximation between options 10 When times are more than times , It is regarded as a big gap , Intercepting two digits is enough .【 There is a big gap in options , You can do some processing with numbers , such as +1 -1 Convenient to divide 】

        The first option is the same as , The secondary difference of the option with the closest size is less than or equal to the first digit , Then it is considered that the gap is small , Intercept three .

（3） Take a pen and start estimating

        If there is a big gap in estimation , You can use numbers +1 -1, Convenient to divide .

        The numerator and denominator of the fraction can be expanded and reduced at the same time .

        No cut is the most accurate , But it's hard to exclude options , So cut . Everything is just for more choices .

【 one 】

         One step division , It refers to the numerator and denominator ; Multistep division refers to the multiplication and division of multiple molecules .

 

【 Ii. 】

         The first thing in the figure below is different. It refers to options ; The first is the same , But the size is closest to the secondary difference of the option > The difference between the first meaning and the second digit is greater than the first digit .

         Self understanding ： If there is a big difference in options, intercept two digits , If the gap is small, intercept 3 position .

         skill ： If the option gap is large , You can process the numbers , Convenient approximate grade . For example, the denominator +1 -1. Because the gap is big , The accuracy requirement is not high .

 

Example

Question type ： There is an approximation between options 10、100 Multiple relationship , The steps to solve the problem are as follows ：  Cut two digits , Pay attention to the magnitude .

  

The following is one-step division . One step division , Truncate the denominator , First same , And the second difference of the closest option is less than the first 2, Then cut three . 

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3. Score comparison

There are only two question types  

         One big one small ： Compare the two scores , One of them is compared to the other , The numerator is big and the denominator is small , This is called one big one small question ..【 The size of numerator and denominator splits , Pay attention to the fraction of molecular weight 】

         

   ： Compare the two scores , One of them is compared to the other , The numerator and denominator are big .【 The numerator and denominator are of the same size , Focus on big scores 】

        

How to solve the problem

（1） The numerator and denominator are larger and smaller , Larger molecules are larger .

（2） Same size 【 Fractions with large numerator and denominator 】, If the denominator is large, it is small , Larger molecular multiples are larger .【 Brief notes ： At the same time, big scores , Larger molecular multiples are larger , Larger molecular multiples are smaller 】

        Two solutions of the same university , How much is the score directly , Then compare the sizes ; Or look horizontally at the numerator denominator multiple . Looking vertically, it is generally the problem that the numerator is larger than the denominator , It can reduce the denominator to single digits .

Self generated fractional questions

（1） If two scores are compared . Look directly at the size of numerator and denominator , According to one big one small 、 Solve problems according to the same principle . There are two ways to deal with it , Among them, the vertical view can be aimed at some specific topics .

（2） If multiple scores choose size , Then find a standard best option , Other options compare with him . Try whether it is easy to determine that the best option is the right answer , For example, estimate the specific means 、 There is a big gap between options , If not , One big and one small 、 Compare with the big rules .

Example  

One big one small Molecules are big  

A fraction whose numerator and denominator are both large , If the denominator is large, it is small .

Compare multiple scores 【 Choose one of the largest and smallest of the four options 】

         choice question , If you choose the largest option , that The molecules should be as large as possible 、 Try to keep the denominator as small as possible Find the best option for this condition . Then compare other options with her to determine the final answer , Sometimes there is no need to compare , You can get the answer directly according to this principle , If you don't get it, you'll give it to others 3 Compare the options with the best options .

（1） Choose the biggest topic , Then the molecules should be as large as possible , Try to keep the denominator as small as possible . Then you can find c As a standard, it is best .

（2）a c、c d comparison , According to Tongda , The greater the molecular multiple, the greater the principle .b d According to one big one small , Judging from the principle that the molecule is big .

remember ： Roughly choose the best option , It doesn't have to be the right answer as a standard .

（1） Empathy , According to the molecular size , Try to keep the denominator as small as possible , choice d As the best option

（2） Other options and d Compare and determine the answer . According to one big one small 、 The same principle is known d It's really optimal . 

 

The following multiple choice question , The denominator is greater than the numerator , Then turn the denominator directly into a single digit , The valuation .

Two 、 Reading materials

1. Written materials

General rule ： Read the materials first and then read the questions , Otherwise, a lot of time will be wasted .

Own habits ： Probably look at what the text says , Then look at the topic , Look back at the text .

characteristic ： More data , There are many similar words

Method ： Time + The subject + structure

Go through the strategy twice ： First pass Time + The subject , Second times Only structure . The structure is to see the total score , Or sub total .

ideologically ： All the data in the article is rubbish

2. Form material

Horizontal ordinate 、 title 、 Company 、 remarks

3. Graphic materials

type ： Bar charts 、 Broken line diagram 、 Pie chart 、 form

Method ： title 、 Company 、 legend

Look at the three elements of the header ： Time 、 The subject 、 Company

If you have notes, please read them

Here's the picture , Two ordinates 、 Two figures . Then the left diagram corresponds to the left ordinate , The right corresponds to the right . 

Here's the picture The pie chart is from twelve o'clock , Sorted clockwise .

 

4. Comprehensive materials 【 written words + form + graphics 】

Method ： Look at each other 、 Find the difference between text and graphics

 

  3、 ... and 、 Base period and current period

 

Base period questions must also be eliminated by looking at the options first to see whether the answer can be given directly . 

Read the questions in three steps ： Lap time 、 Judge the question type 、 Define the subject .

Formula derivation ：A/(1-r) The numerator and denominator are multiplied by 1+r , Denominator square difference r square Is almost zero , therefore 1-r^2 Can be seen as 1.

So remember the company a/(1-r) = a+ar Don't take the middle step , In this way, each calculation saves 10s Time is at least . 

 

Base period comparison topic  

Exclude first and then formulate . Try not to formulate , Too slow .

Base period volume comparison Topic judgment ：1. Now ask for the past 2. Seek the maximum and the minimum This type of question is usually the comparison of base period and quantity .

Base period quantity comparison problem solving method ：1. Find the base period , Roughly estimate Let's see if we can directly rule out the answer . 2. The determinant Score comparison method .

（1） Decide the question type first .2016 It is known that , seek 2012, It can be seen that it is the base period , At most, it is the base period comparison . Then exclude it from the determinant

（2） Draw the subject 、 Time , Find the corresponding position in the data . And then calculate .

（3） Roughly estimate and compare the results .

Sort the title 【 A topic type in the base period comparison 】

There are two methods for sorting questions ：1. Look at the best value 2. See options .

For example, the following question , See the maximum and minimum areas of options . Find the maximum value from the formula 、 minimum value , You can exclude the options as D.