A few math problems won t. There are a few math problems that won t

4th power -y = (9x +y) (9x -y) = (9x +y) (3x+y) (3x-y).

m+2 power-b·a's m-power=a(a-b)=am(a+b)(a-b).

Simple calculations with factorization. (Write down the detailed answer process).

1.(4 and 18/19) 4 and 1/19).

4 and 18/19 + 4 and 1/19) (4 and 18/19 - 4 and 1/19).

2.(5/7 of 123) 2/76).

123 and 5/7 + 76 and 2/7) (123/5/7 - 76 and 2/7)).

200*47 and 3/7

Use your brain, it's all done for you, and you still won't be able to do it in the future.

This is very rudimentary, agree with the upstairs, and you can't ask online as soon as you don't know"Know"Yes.

Remember the formula: a 2-b 2=(a+b)*(a-b) This is the process, and it will come out in one step.

m+4n)*(m-4n)

2x+y)*(2x-y)

9x+4y)*(3x+2y)*(3x-2y)5a+6b)*(5a-6b)

3a+b+c)*(3a-b-c)

3x+2y)*(x+2y)

9x^2+y^2)*(3x+y)*(3x-y)a^m(a+b)*(a-b)

Summary. There are several ways to explain high school mathematics in detail: 1. Matching methods:

An analytic formula is divided into a sum of the powers of one or several polynomials by means of identity deformation. 2. Factorization: Factorization is the form of multiplying a polynomial into several integer products.

3. Substitution method: The so-called substitution method is to replace a part of the original formula with a new variable or transform the original formula in a relatively complex mathematical formula, so as to simplify it and make the problem easy to solve. 4. Discriminant method and Vedic theorem:

Discriminant discrimination of the roots of the unary quadratic equation ax2+bx+c=0 (a, b, c belong to r, a≠0), =b2-4ac,. Vedic theorem finds another root in addition to knowing one root of a quadratic equation; In addition to simple applications such as knowing the sum and product of two numbers, you can also find the symmetry function of the root.

There are a few math problems that won't

There are several ways to explain high school mathematics in detail: 1. Matching method: using the method of identity deformation of an analytic formula, some terms are matched into the sum form of one or several polynomials to the power of positive integers.

2. Factorization: Factorization is the form of multiplying a polynomial into several integer products. 3. Substitution method:

The so-called commutation method is to replace a part of the original formula with a new variable or transform the original formula in a relatively complex mathematical formula, so as to simplify it and make the problem easy to solve. 4. Discriminant formula method and Vedic theorem: discriminant of the root of a quadratic equation ax2+bx+c=0 (a, b, c belong to r, a≠0), =b2-4ac,.

Vedic theorem finds another root in addition to knowing one root of a quadratic equation; In addition to simple applications such as knowing the sum and product of two numbers, you can also find the symmetry function of the root.

emmI'm a sophomore.

17 and 18 here don't know how to go.

Good. 17 The answer is n (m-6), b (4a deuce - 9b deuce) platform stipulates that only one problem can be solved, you need to click to buy upgrade consultation, I can solve other problems for you.

1. Set up x apple saplings and Y pear saplings, with a total of z Young Pioneers.

x=2y; y=3*z+2; x=7*z-6;

The solution yields x=64 y=32 z=10

2. The number of grains distributed in each class is equal and x.

x-2)+(x+2)+(x2)+(2*x)=180x=40, then 1 class: 40-2=38

Class 2: 40+2=42

Class 3: 40 2=20

Class 4: 40*2=80

1 7x-6=6x+4

x = 10 apple tree 64

ISU 322 x-2+x+2+x 2+2x=180x=40, the original classes were 38, 42, 20, 80

If there are x parts in this batch, then the task ratio of master and apprentice is (5+1): 5=6:5, that is, there are (6x 11) 12=(5x 11-30) 7 solutions to get x=220

If the master processes x parts, then the apprentice processes 840-x parts, then there are 5x 8=2*(840-x) 3+60

The solution is x=480 and 840-x=360

The ratio of the distance taken by Xiao Ming to the distance traveled by Xiao Gang is (4+1): 4=5:4 The ratio of the time taken by Xiao Ming to the time taken by Xiao Gang is 9:

9+1)=9:10, so Xiao Ming's speed is faster than Xiao Gang's (5 9)-(4 10)=7 45 Set the original price of a movie ticket x yuan.

According to the title, it can be obtained.

x-3) (1+1 2)=(1+1 5)*x can be solved x=15 yuan.

That is, the original price of a movie ticket is 15 yuan.

If the apprentice's part is x, then the master is 6 5x

then there is (6 5x) 12=(x-30) 7

Solution: x=100

Then there are 6 5x+x=220 parts.

1 Set the number of apprentice tasks x The master is 6 5x, and after setting y days, you get 12y=6 5x and 7y=x-30 then y=10 x=100

Total number x+6 5x=2202

1: 135

2: 6cm

3: 2—6（x—1）=3（1—x）x=5/3

1\3（x+1）—x=1\7（2x—1）

x=4: Solve the purchase of x kg of pears.

Question 1: 3x+4(5-x)=17

x=3 2nd question: 300 (60+90) = 2 hoursAnswer: ......

x=2 The second solution equation is incomprehensible.

Set apples x kilograms. pears y kilograms.

1 equation: x+y=5

2 equation: 4x+3y=17 then: x=2 y=320 minutes.

Set the purchase price to $x.

x+7)13=(x+11)12

13x+91=12x+132

x=41 This is the money you make less by selling 1 less.

So the purchase price is 41 yuan (a bit far-fetched. ）

3000+3000 RMB.

5 There are x in total.

x=240

Since x is easily confused with x, I'm setting up a here

1. Formula: 11x12-7x13=?

Equation: Let the purchase price a, this is by finding the equivalent relation.

11x12+12a=7x13+13a

11x12-7x13=13a-12a

a=412, profit: 3000 * yuan, tax deduction: 243 * (yuan.

Even the principal with interest.

3. All related to 1 20.

54 1 20 45 20 1 20=(54+45+1) 20=54.

Both sides of the equation are the same as x5 a = 240 (branches).

Equation: Solution: Let the purchase price of this commodity be each x yuan, and the equation is obtained according to the meaning of the question

13×(7+x)=12×(11+x)

Get: x=41

The purchase price of this commodity is 41 yuan each.

Idea: According to "cost + profit = unit price", first use x to indicate that when the profit is 7 yuan and 11 yuan, the unit price of the commodity is 7 + x and 11 + x respectively, and then according to the number of each commodity sold to find the total price of the two sold goods, respectively, 13 (7 + x) and 12 (11 + x), because "each 11 yuan profit sells 12 for the same amount of money", so the total price of the commodity is sold in two different quantities and **, so 13 (7 + x) = 12 (11 +). x) 2 3000x2,7%x3x5%=12,15 (yuan),85 (yuan)3000+230,85=3230,85 (yuan) answer; Yes, 3230,85 yuan. ⒊54×1/20＋45÷20＋1/20

5 There are x in total.

x=240

Question 1: The first day of the paving of 1 5, that is, the paving of 20 * 1 5 = 4 meters, the remaining 20-4 = 16 meters, there are 3 days, 5 meters per day, three days is 3 * 5 = 15 meters, can not be completed.

Question 2: If 45 red balloons are used, then white balloons = 45 * 2 3 = 30 then blue balloons = 30 * 4 5 = 24.

Question 3: Time saved = 50 * 1 5 = 10 minutes Now it takes 50-10 = 40 minutes to type.

Question 4: 1m3 = 11 5 divided by 5 = 11 25 tons.

Question 5: 2 3 divided by 4 = 1 6

If you don't understand, please ask, if you think you can help, please give a satisfaction.

Question 1: 20 5/5 = 4 meters 3*5 = 15 meters 15 + 4 = 19 meters No.

Question 2: 45 times two-thirds = 30 30 times four-fifths = 24 24 blues.

Question 3: 50 times 5/5 = 10 50-10 = 40 points.

Question 4: 5 3 = 3/5 11/5 multiplied by 3/5 equals 3/5 tons.

Question 5: 4 4 = 1 Two-thirds divided by 4 equals one-sixth Read one-sixth every day.

Study hard!