Math Formula,,, help, help solve math formulas?

Sphere volume = 4 3 (r3).

Area = (r2).

Circumference = 2 r = d

The standard equation for a circle (x-a) 2+(y-b) 2=r 2 Note: (a,b) is the coordinates of the center of the circle.

The general equation for a circle x2+y2+dx+ey+f=0 Note: d 2+e 2-4f>0

It's a good idea to go to a bookstore and buy a middle school math formula book.

You can find it on the Internet, choose me, I wish you a smooth college entrance examination in the third year of junior high school.

1) Let the cost function be c=ax+b, then there is:

0xa+b=100

100xa+b=400

The solution gives a=3 and b=100, so the cost function is c=3x+100

The fixed cost is $100.

2) When the output is 200, the total cost is 200xc=200x(3x200+100)=100000 yuan, and the average cost is 100000 200=500 yuan.

2) The revenue function for this commodity is p=r-c=8q-(21+5p), i.e. p=3q-21

When the sales volume is 200 pieces, the total revenue is pxq=3qxq-21xq=200x(3q-21)=600x(1000-5p)=600x(1000-5x200)=48000 yuan.

3) (1) The profit function of this commodity is l=p-c=3q-21-(21+5p)=3q-5p-42

2) When the sales volume of this brother sail is 4, the total profit is lxq=3qxq-5pxq-42xq=4x(3q-5p-42)=4x(3x1000-5x200-42)=-796 yuan, and the average profit is l q=(3q-5p-42) q=3-5 q-(42 q+5p q)=3-5 1-(42 1+5x200 1)=-796 yuan.

3) When the sales volume of hail is 10, the total profit is lxq=3qxp-5pxq-42xq=10x(3q-5p-42)=10x(3x1000-5x200-42)=-796 yuan, so the sales volume is 10.

10,000 yuan increases by 3% every month

10000x (1+3%) to the power of 12.

to the 12th power.

This is divided into two cases, the first is directly multiplied by 1446.

The second type of segmentation calculates 600*3+300*

A total of x pieces have been completed, and the total amount = x*3+(x-600)*

Note: When x 600, the part after the first plus sign of the above equation is invalid 600< x 900, the part after the second plus sign of the above equation is invalid 900

Completed 1446 pieces should be issued: 1200* yuan. Hope it helps.

Analysis 3512 unchanged unchanged unchanged What has changed is these positive integers.

So the formula is:

351 2 * n * n
）

Growth rate = (latter former) former 100%.

Also, your statement is inappropriate, and it should be called sequential growth, not year-on-year growth.

Compared with June last year, this year's June is called a year-on-year increase.

It is known that it earned 3,000 yuan in January and 5,000 yuan in February, a year-on-year increase.

（5000-3000）/3000】x100%=

Vedic theorem. It is used in quadratic equations. ax squared + bx + c = d.

Knowing a b c can find the values of x1+x2 and x1x2.

What it expresses is the relationship between the two roots of the equation x1 x2 and the coefficients ab c.