(x+y)(x2-xy+y2)

(x+y)(x2-xy+y2)

Primitive = (x + y) [(X-Y) ² + XY]
=(x²-y²)(x-y)+x²y+xy²
=X & # 179; - X & # 178; y-xy & # 178; + Y & # 179; + X & # 178; y + XY & # 178; (- X & # 178; y-xy & # 178; + X & # 178; y + XY & # 178; offset)
=x³+y³
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Wish you progress in your study/

In the tree planting activities, the ratio of planting trees in the fourth and fifth grades is 5 to 7. How many trees are planted in the two grades?

60÷（7－5）×（7＋5）
＝60÷2×12
＝30×12
= 360

18 is six less than two fifths of a number. What's the number?

Let the number of times be x, then 2x / 5-18 = 6
The solution is x = 60

If there are three numbers a, B and C, the sum of a and B is 147, the sum of B and C is 123, and the sum of a and C is 132, then the average value of these three numbers is______ ．

(147 + 123 + 132) △ 2 △ 3, = 402 △ 2 △ 3, = 201 △ 3, = 67; answer: the average value of the three numbers is 67

Write a polynomial (1) which only contains the letter X (2) and does not contain a linear term (3) satisfying the following conditions at the same time

2x²+1
Quadratic binomial

The sum of a and B is 38.5, and the decimal point of a is moved one place to the left, which is equal to the sum of B and a

Let a and B be x and Y respectively
X+Y=38.5
X/10=Y
The solution is x = 35, y = 3.5
35 for a and 3.5 for B

If the function f (x) = 1 / 3x ^ 3-2ax + 3A ^ 2x has a minimum value in (0,1), then the value range of real number a

There are two cups. Cup a contains 50 ml of water and cup B contains 120 ml of water. If you look at two cups and put the same sugar in cup a, put 35 g in cup B
Which cup of water is sweeter after mixing 80 grams

Cup a = 35:50 = 7:10 = 7 / 10 = 21 / 30
Cup B = 80:120 = 2:3 = 2 / 3 = 20 / 30
So, a cup is sweet

To solve another problem, use Clem's rule or elementary row transformation of augmented matrix to solve linear equations
x1+x2+x3=6
2x1-x2+x3=3
-x1-x2+x3=0

The results show that the solutions of the equations are: (1,2,3) ^ t

Party A and Party B process the same parts. Party A processes 360 parts in 3 hours and Party B processes 400 parts in 4 hours. What is the time ratio between Party A and Party B in processing each part ()?
There are also 10.8 yuan for hard candy and 14.8 yuan for soft candy per kilogram. After mixing the two kinds of candy, the price is 12.3 yuan per kilogram. Do you know the weight ratio of the two kinds of candy after mixing?

The time ratio of a and B is the speed ratio of a and B, 360 / 3 = 120, 400 / 4 = 100. The time ratio of 6 to 5 can be obtained by 120 △ 100
If the weight ratio is a / B, then
10.8a+14.8b=12.3(a+b)
The results are as follows
14.8b-12.3b=12.3a-10.8a
The solution is a / b = 5 / 3