The first volume of the first year of junior high school is a problem of solving practical problems with linear equation of one variable In the 22 rounds of the Super League, a team scores 27 points. The ratio of the number of draws and losses is 2:3. Find the number of wins of the team

The first volume of the first year of junior high school is a problem of solving practical problems with linear equation of one variable In the 22 rounds of the Super League, a team scores 27 points. The ratio of the number of draws and losses is 2:3. Find the number of wins of the team

3x+0.4*(22-x)=27
x=7

Engineering problems of linear equation with one variable
For a project, it takes 10 days for Party A and Party B to cooperate, 18 days for Party B to do it alone, and how many days for Party A to do it alone?

It takes X days to complete the design
1/X+1/18=1/10
1/X=1/10-1/18
1/X=（18-10）/180
1/X=8/180
1/X=2/45
X = 45 / 2 = 22.5 days

&Nbsp; when 2x ^ 2-2x-4 = 0, 3x ^ 2-3x + 5 = 0=____
&When m=___ The equation (2m-1) x ^ 2 - (m-1) ^ 2x + 2m = 0 is a quadratic equation with one variable
If the univariate quadratic equation MX ^ 2 + X + 2m ^ 2 + 3M = 0 has a root of 0, then M=_____

When 2x ^ 2-2x-4 = 0, 3x ^ 2-3x + 5 = 0 = 11
When m ≠ 1 / 2, the equation (2m-1) x ^ 2 - (m-1) ^ 2x + 2m = 0 is a quadratic equation with one variable
If the univariate quadratic equation MX ^ 2 + X + 2m ^ 2 + 3M = 0 has a root of 0, then M = - 3 / 2

As shown in the figure, a 9cm long and 5cm wide rectangular cardboard can be made into a non covered rectangular carton with a bottom area of 12cm2 by cutting out the same square from each corner of the cardboard. If the side length of the cut out square is xcm, the equation about X can be listed as follows______ ．

Let the side length of the cut square be xcm and (9-2x) · (5-2x) = 12

What is the formula for the surface area and volume of a cylinder? What is the formula for the volume of a cone?

Surface area of cylinder = side area + bottom area × 2 = perimeter of bottom surface × height + π × radius #;
Volume of cylinder = area of bottom × height = π × radius and#178; × height
Cone volume = 1 / 3 × bottom area × height = 1 / 3 × π × radius # 178; × height

The sum of a and B is 66, the quotient of a divided by B is 7, and the remainder is 2. How many are a and B?

A + B = 66
A = 7 * B + 2
7 * B + 2 + B = 66
8 B = 64
B = 8
A = 7 * 8 + 2 = 58

If the side area of a cone is three times of the bottom area, then the degree of the center angle of the expanded side view of the cone is ()
A. 180°B. 120°C. 90°D. 60°

Let the radius of the bottom circle be r, the radius of the side expanded sector be r, and the angle of the center of the sector be n degrees

How does matlab run m file?

There are two ways to run. One is to input the name of the. M file in the command center (if there is a parameter, you need to give the parameter); the other is to run directly in the. M file editing environment. Generally, you can select run in the debug menu item or press F5 directly
The running result is also displayed in the command center (if it is drawing, it is the figure window)

1. If a > b, E > F, C > 0, then F-AC < e-bc
Verification questions·

a＞b.c＞0
Then AC > BC
Then - AC

Calculation of area and perimeter of circle in Grade 6 of primary school mathematics
1. A circle is cut along the radius from the center of the circle to form an approximate rectangle. It is known that the circumference of the rectangle is 6cm larger than that of the circle, so the area of the circle can be calculated
2. The side length of a square is 2 meters. Draw the largest circle in the square. How many square meters is the area of the circle?
3. For a circular disk, the radius of the outer circle is 10 cm, and the radius of the inner circle is 8 cm. How many square centimeters is the area of the circular disk?
4. A 20 meter long rope has 4.3 meters left after 10 circles around the trunk. How many square meters is the cross-sectional area of this tree?
5. Uncle Zhang fenced a semicircular vegetable field against the wall. The fence is 12.56 Li long. How many square meters is the vegetable field?

1. The square of (6 △ 2) × π = 28.26
2. The square of (2 △ 2) × π = 3.14
3. (square of 10 × π) - (square of 8 × π) = 36 π = 113.04
4. Square of [(20-4.3) △ 10 △ π △ 2] × π = self calculation
5. The square of (12.56 × 2 △ π △ 2) = self calculation
My first year, the topic must be right, and I'm good at math