Factorization of a Λ 3b-a B Λ 3

Factorization of a Λ 3b-a B Λ 3

a∧3 b － a b∧3=ab(a∧2-b∧2)=ab(a+b)(a-b)

Factorization: a tripartite + B tripartite = a tripartite - B tripartite=

a^3+b^3=(a+b)(a^2-ab+b^2)
a^3-b^3=(a-b)(a^2+ab+b^2)

How to improve math scores? The first semester of grade five in primary school

1. In the new class, we should preview first. 2. Listen carefully in class and digest what the teacher has said. 3. Ask the teacher if you don't know how to do more. 4. Keep your mind moving in class and don't be distracted. 5. Do exercises after class. 6. Don't always compare with poor people and with good people. There are also: 1. Review should pay attention to five strategies. 1. Remember the concept clearly and lay a solid foundation

How to solve 32 + 20x = 2 (58 + 4x)

32＋20x＝2﹙58＋4x﹚
32+20x=116+8x
20x-8x=116-32
12x=84
x=7

How about one ninth and ninety-nine and ninety-nine and ninety-nine and ninety-nine and ninety-nine

1/9+1/99+1/999+1/9999
=1111/9999+101/9999+1/999+1/9999
=1213/9999+1/999
=134643/1109889+1111/1109889
=135754/1109889
About = 0.1223

How to do the sixth question on page 21 of the mathematics homework book of the eighth grade of Junior Middle School of Zhejiang Education Press

1. Syndrome △ abd ≌ CBE
2. Also prove △ abd ≌ CBE

The price of a commodity first increases by 1 / 10 and then decreases by 1 / 10. The current price is 9 / 10 of the original price

（1+1/10）×（1-1/10）
=11/10×9/10
=99/100
The current price is 99% of the original price

It is known that y = f (x) (x belongs to D, D is the domain of the function) satisfies the following two conditions at the same time;
1, the function f (x) monotonically increases or decreases in D. 2, if there is an interval [a, b] containing D, so that the value range of function f (x) in the interval [a, b] is [a, b], then y = f (x), X belongs to D and is a ratio closed function
(1) Judge whether the function f (x) = 1 + x-x ^ 2 (x belongs to (0, + ∞) is a closed function, and explain the reason
(2) It is proved that the function y = - x ^ 3 (x belongs to [- 1,1]) is a closed function
(3) If y = K + radical x (k < 0) is a closed function, the value range of real number k is obtained

Just let y = x, replace y with X, and solve the equation of one variable
1: The solution is x = - 1, x = 1), so it is not in the range of (0, + ∞);
2: The solution is x = - 1, x = 1
3: (0,1 / radical 2)

Find 10 approximations from the newspaper. When do you need approximations in your life,
emergency

There are a lot of data in life that can not get accurate values, the most common length, height, angle degree, etc. there are also some estimated data such as traffic flow, population and so on
For example: height 156cm, weight 45kg, angle a = 36 degrees, China has 1.3 billion people, daily traffic is 100000, and so on

The original price of a commodity is 50 yuan. After the price is increased by 100%, if you want to restore the original price, you should reduce the price ()
A. 30%B. 50%C. 75%D. 100%

Let the percentage of price reduction be X. then: 50 × (1 + 100%) × (1-x) = 50, the solution is: x = 0.5 = 50%, so B