How many times a week can bitcoin pay dividends
the first time, in March last year, bitcoin soared from tens of dollars to 266 dollars overnight
for the second time, the United States held a bitcoin hearing on September 18 last year. Before the hearing, the Federal Reserve and other relevant people looked at bitcoin. Under the influence of the good news again, the price of bitcoin rose to 8000 yuan
the third time is ring this year's World Cup. Due to the influence of the world cup, the price of bitcoin once approached 6000
for the fourth time, bitcoin suddenly rose to 3000 yuan after six months of continuous downturn and hovering around 2400 for a long time. It is said that it is the entry of hot money.
the number ability is traditionally proposed as follows:
logical thinking ability
basic operation ability
space imagination ability
Application of number knowledge
ability to analyze and solve practical problems and ability to establish number model
according to the ecational objectives:
number knowledge,
citizen
consciousness, social needs As we all know,
computational ability is the important ability of number.
the lack of computational ability is the key to the development of number.
the cultivation of computational ability must be paid more attention to Preliminary calculation
tall buildings are flat
think firmly about the foundation of high buildings
know that the foundation of the primary foundation stage is more important
the foundation of seven stages is generally solid
poor number operation skills
poor number cultivation and sweat, blind problem-solving habit
although doing some problems
no real thinking<
second rational number concept,
then
grasp the key points accurately
use often neglects the other
can put the vector to guide the operation
my teaching practice
pay attention to the four links:
, pay attention to the foundation, grasp the key
rational number
lay the foundation for algebra
arrange the initial
unit knowledge, determine the following points for the development of initial number:
1
,
Pay attention to knowledge and base on far-reaching development: the number axis, absolute value, opposite number and other related knowledge reserve enter the beginning of number addition
we should pay special attention to each kind of operation and discuss it
the image cutter joked
said:
when the calculation is announced directly in class, we should start to do the problem consolidation
we must fully grasp the concept of new curriculum standard
fully understand the spirit of the new curriculum
pay attention to knowledge and development
exploration should be set up around the appropriate situation
let full observation, thinking, class, discussion and expression, with understanding, the only way to make accurate
use is accurate, smart calculation
2
,
Qualitative first, emphasis on operational norms: compared with number, introce negative number
calculation
completely break the balance of less sign errors. Examples of miscalculation are as follows:
calculation column questions:
(1) - 1 + 3
(2) - 12-2
(3) (- 3) x (- 5)
solution
:
original formula
= - 4
solution
:
original formula
= - 10
solution
:
the original formula
= - 15
all cause trouble qualitatively All kinds of operations should be qualitatively put in the first place. If the symbol is wrong, it must be strictly required in the calculation operation. At the beginning of the operation, we should pay great attention to it. If we don't strictly follow the standard number language, we should arrange it according to the actual situation. For example, if we add two numbers with the same number, we will have negative surname Family blind date
add up two numbers of different numbers
add up East and West, who is strong, who listens to fight, who is weak, master
and is willing to learn to let you know: I want to be blind and friends with each other
3
Pay attention to the mixed operation and strengthen the operation order: the teaching of the advanced stage of the mixed operation should be special
don't emphasize the operation order
standardize the operation proceres to avoid detours. Teachers are required to read the questions as a whole and observe the mixed operation first
which operation brackets should be calculated first should be calculated according to the rules
the teacher's blackboard writing should be neat
and demonstrate the formula of calculating the exact number
ecation should be carried out step by step
steadily
through mistakes and friendly reminders
let them fall first and then touch stone gold
memory should be more profound
4
, reminders should be patient and take part in calculation with a determined attitude, and the writing steps should be complete
the key steps should be omitted suddenly to reflect the thinking of calculation sequence
2 Integral addition and subtraction start:
end of number processing unit
enter the stage of true algebra
letter represents number
letter represents number unit
integral addition and subtraction
calculation play
in order to improve the calculation ability of integral addition and subtraction
we must pay attention to Teaching
the whole process should be designed macroscopically and the operation process specification should be strengthened microscopically
1
First zeroing and then zeroing: integral addition and subtraction must be the same as
class items before merging the same kind items. We must have a clear understanding that the same class items must have two conditions:
(1)
contain the same letter<
(2)
the same letter index
the same
two conditions are missing
to identify exactly the same kind of items
the exploration of general ecation makes it clear that the combination of similar items is actually
the addition and subtraction of coefficients and the maintenance of letters and their index become two bottlenecks of bracket knowledge learning:
(1)
, symbol error<
(2)
, present missing multiplication
in two thorny problems
learning bracket
abstract generalization is important
Practical Teaching
summary bracket
then condenses
'+'
(
) sign change<
'-
'
(
) want to change the number
Lang Lang kourao
interest
clear memory
use the multiplication formula bracket
pay attention to the number multiplication formula bracket for each item
give each child in the same class moon cake
give Li Si to eat
cry nose
give everyone who eat happy
every
child needs moon cake
2
, and
Pay attention to the operation rules, strengthen the calculation details: the details decide to lose, and the calculation questions are even more voted down: wrong steps
wrong teaching must standardize the steps of solving the problems, and make clear which steps should be added and subtracted by the integral form. Each step should be made clear
do the general example questions and practice the steps of adding and subtracted by the integral form
2
marker
3
exchange<
4
merging is concise and comprehensive, and the integral addition and subtraction calculation process is operated according to the Department and shift
less calculation blindness and improve the calculation ability
3
To understand the essence of the problem: there are few types of integral addition and subtraction, and the way to solve the problem should be practiced properly
to learn and add points
to calculate the value of the algebraic formula
often thinking set
letters replace numbers directly into the integral formula
to calculate
irrationality, considering the complexity of the algebraic formula
fatigue
teachers must point the position
let Ming
simplify the integral formula first and then interpret the evaluation strategy<
...
Jiehan
x
item calculation
m
value problem
to solve the problem, the teacher must enlighten:
Jiehan
x
item index algebra
simplification and combination
x
item coefficient
= 0
the chief teacher must recognize the new problem and try to solve it True thinking and conclusion
only by
can the ability of integral addition and subtraction be improved
to a new level
Huili Shoes Co., Ltd. is an independent corporate enterprise fully invested by Shanghai Huayi (Group) company. It is specialized in R & D, manufacturing and sales of Huili brand sports shoes and all kinds of shoes procts, and exports to dozens of countries and regions such as Southeast Asia, the Middle East, Europe and the United States
based on the proct development concept of "people-oriented, advocating sports and promoting health", Huili shoes develops a series of popular and popular sports and leisure shoes, and develops high-tech cold adhesive professional sports shoes and outdoor fitness shoes
in recent years, Huili shoe instry has established the proct structure orientation of "fashion sports, health sports and professional sports" (for young people, middle-aged and old people and professional consumer groups) around the brand connotation theme of "classic, fashion and professional"
extended materials:
the development history of Huili shoes:
Huili shoes originated from the rubber factory in the period of national capitalism
In 1927, a factory named "Yichang rubber factory" appeared on Tangshan Road in Shanghai, which proced a kind of overshoes named "Baji". Later, Yichang rubber factory changed its name to "Zhengtai Xinji rubber factory", and later developed into one of the landmark enterprises of national rubber instry in old China In April 1935, Shanghai Zhengtai company officially registered the Chinese "Huili" and English "warrior" brands. The originality of Huili trademark comes from the English word "warrior", which means "warrior, warrior, fighter". Therefore, the homonym of "warrior" leads to the Chinese trademark name of "Huili"“ "Huili" means "the power to return to heaven" and "the great power to overcome difficulties" In 1948, after the "National Games" held by Shanghai Jiangwan Stadium, because of the outbreak of the war of liberation and traffic disruption, it was difficult for Liaoning men's basketball team members who went to Shanghai to return. Through Qian xucang's introction, Zhengtai Xinji rubber factory decided to set up "Huili basketball team". As the team moves around, "Huili" has become a popular shoe for professional athletes In 1979, Huili wb-1 basketball shoes were developed. Two years later, the Chinese women's volleyball team won the Third World Cup. As a result, young people are chasing each other and changing into Huili shoes before PE class has become a fashion in the 1980s However, with the development of market economy and reform and opening up, Huili has encountered an unprecedented crisis. On the one hand, a large number of foreign sports brands, such as Nike, Adidas and converse, have poured into China and become popular new procts for young people; On the other hand, domestic private enterprises have sprung up, with 30000 shoe-making enterprises alone, one third of which are rubber shoes factoriesafter closing the first branch in 1994, Huili closed one branch almost every two years. Six years later, Huili's seven branches and one research institute have all closed down, and 8600 workers have been laid off
in 1990, according to the requirements of Shanghai municipal government, Shanghai Zhengtai Xinji rubber factory and Shanghai Greater China rubber factory became the rudiment of Shanghai tire rubber (Group) Co., Ltd., but mainly engaged in tire business
in 2000, "Huili" series trademark was transferred to Shanghai Huayi Group, and Shanghai Huili shoes factory officially stopped proction. Subsequently, Shanghai Huayi implemented the bankruptcy plan of the old Huili enterprise, and the Huayi Group and the operator group jointly invested to establish Shanghai Huili Shoes Co., Ltd. Huili has changed from a proction-oriented enterprise to a trade oriented enterprise with brand operation
After the system reform, the group company invested to set up the current company. GUI Chenggang told reporters that the trademark was commissioned by Huayi Group. Based on its exclusive operation and management, the Group operates Huili brand. Huili is able to enter a new stage