Mathematical calculation problems. The second year of junior high school. Be more detailed, everyone

Root number 5 (root number 15-4 root number 3 5) = root number 3 (root number 1 + 2 root number 3) (3-root number 3) = 5 root number 3-3

2 + root number 3) (2 - root number 3) = 1 (5 + 3 root number 2) square = 43 + 30 root number 2

Root number 3 minus 1 point root number 2 = root number 3 - 1/2 root number 2 2 + root number 2/3 - root number 3 = 2 + 1/3 root number 6 - root number 3 10 root number 3 + 2 root number 7-4 root number 3 = 2 root number 7 + 6 root number 3 5 root number 12-7 root number 8 - root number 48 = 6 root number 3-14 root number 2

Root number 8 - (3 root number 32-2 root number 18) = -4 root number 2 (5 + 2 root number 7) - (4 + root number 7) = 1 + root number 7

2 + root number 5) (root number 5 of 3-2) = 6 root number 5-20

3 + root number 7) (3 - root number 7) = 2

3 + 2 root number 3) square = 21 + 12 root number 3

root number 5 - root number 10) = -15

Root number 3 minus 1 point root number 2,

2 + 2/3 of the root number - 3 of the root number

10 root number 3+2 root number 7-4 root number 3

5 root number 12-7 root number 8 - root number 48

Root number 8- (3 root number 32-2 root number 18).

5+2 root number 7)-(4 + root number 7).

2 + root number 5) (root number 3-2 of 5).

3 + root number 7) (3-root number 7).

3+2 of the root number 3).

root number 5 - root number 10).

What is this? Elementary school students don't understand, it's really a little hard to understand.

1. Find the square root and the square root of the arithmetic number of the following numbers.

1: 10 4 square root 10, arithmetic square root 10 square root number 81 square root 9, arithmetic square root 9

Root number 13 2-13 2 square root 0, arithmetic square root 02 root number 1 100 = 1 10

Root number|-3 of 1 16|= root number 3) 4

Positive and negative root number 25 2-12 2= 3 (root number 39) 3 from the title: x+3y-5 0,|2x-y-3|0, then:

x+3y-5=（2x-y-3）²=0

Introduce 4y-x-2=0;3y=5-x, so x+y=3

1. Solution: There are x players.

x（x-1)/2=28

Solution: x=8Answer: There are 8 players.

2. According to the same length of sagging, it can be seen that the length of the tablecloth is also 3 feet more than the width, and the width of the tablecloth is x feet, and the length is (x+3) feet.

x（x+3）=2*6*3

x^2+3x=36

x^2+3x-36=0

Solution: x approx. =

So x+3=

Answer: The length of the tablecloth is a ruler, and the width is a ruler.

3. When the line is arranged in a square, the number of people on one side is x.

x 2+100=(x 2+13) 2-29 solves: x=20

So x 2+100-500 (people).

A: There are 500 students in total.

o(∩_o~

1: If there are x people in the grade participating in the competition, then.

x(x-1)=28x2

x²-x=56

x²-x-56=0

x-8)(x+7)=0

So x=8 or -7 -7 doesn't fit the topic and go so there are 8 players.

1. There are x players, and each player takes the initiative to invite any other player to play all the games, which is x(x-1), but each player who takes the initiative to invite once will be invited once in turn, so every two people are counted twice in the game, then the real number of times should be 1 2*x(x-1)=28 receive x=8

2. If the length of the tablecloth droop is x, the area of the tablecloth is (x+6)*(x+3), according to the title, (x+6)*(x+3)=2*6*3, and the solution is about equal to the ruler), then the length and width of the tablecloth are and.

3. Let the number of people on the edge of the square at the beginning be x, then there is x 2+100=(x 2+13) 2-29, and the solution is x=20, then the total number of people is 20 2+100=500.

1.(1) Let the annual profit growth rate of the company be x

1500×（1+x）²=2160

Then solve the equation to find x

The profit in 2007 was 1500 (1+x).

2) The profit in 2009 was 2160 (1+x) (the specific answer is calculated by yourself).

2.Let the price of this table lamp **** be x

40-30+x)(600-10x)=10000 solution x, the table lamp is priced at (40+x), and the table lamp (600-10x) should be entered

Let the growth rate x

1500(1+x)(1+x)=2160

x = profit in 2007 = 1500 (1 + x) = profit in 18002009 = 2160 (1 + x) = 2592 set price for x, profit x - 30

Sales volume = 600 - (x-40) * 10 = 1000 - 10 x total profit = (x - 30) (1000 - 10 x) > = 10000 solution inequality -10 (x - 30) (x - 100) > = 10000 when x = 65 maximum, sales 350 profit 22750 x 2-130x + 2000 < = 0

。<=x<= 。。It's all within that.

(1) The annual growth rate of each year is a

So the profit of 2008 is.

1500x(1+a)x(1+a)=2160 gives a=

So the profit in 2007 was 1500x (1 + million yuan) (2), and the profit in 2009 was 2160x (1 + million yuan) 2

Let the annual growth rate be x(x>=0), and the following equation can be obtained according to the title:

1500*（1+x）2＝2160

x=then let the profit in 2007 be y, and you can get:

y=1500×（1＋

2009 profit z=2160 (1+.)

ACD = D obtained by AC DE

And because Qin Zheng acd= b

So d= b – 1.

Because the number refers to ACB + ACD + potato first match D = 180 degrees E + D + DCE = 180 degrees and ACD = D

So acb= e – 2 formula.

So a= dce – 3 formula.

ASA certified.

1 4 * 3 + 9 * 6-2 * 2 * 3 * root number 6 * root number 3 = 66-36 * root number 2

2 Up and down at the same time (root number 5 + 2) to get (root number 10 + 2 * root number 2) (5-4) = root number 10 + 2 * root number 2

1.Factoring in the range of real numbers: x 5 (x+ 5)(x-5) (without procedure) 2

Calculation: Knowing the root number of x 5 2, find the value of one-half of x x (process) x 1 x =(x+1 x) -2 by x= 5-2 to get 1 x= 5+2 x 1 x =(x+1 x) -2=( 5-2+ 5+2) -2=5-2=33Solve the equation:

4x 15 (process) Is this the equation? process) first calculate the discriminant formula = (-2) -4 4 (-1) = 20 x=(2 20) 8x1=(1+ 5) 4 , x2=(1- 5) 4 5Knowing that a, b, and c are the three sides of abc, and that there are two equal real roots of a quadratic quadratic equation for x, x - (b-c)x=(a-b)(b-c)=0 (b-c)(a-c)=0 (b-c)(a-c)=0 (b-c)(a-c)=0 (b-c)(a-c)=0 (b-c)(a-c)=0 b=c or a=c The shape of ABC is an isosceles triangle.