To buy the same cloth, Aunt Zhang bought three times as many meters as Aunt Li, so she paid 32.8 yuan more. How much did Aunt Zhang and Aunt Li each pay

Let Li pay X Yuan and Zhang pay 3x yuan
3X-X=32.8
2X=32.8
X=16.4
3x = 16.4 * 3 = 49.2 yuan
A: Li pays 16.4 yuan and Zhang 49.2 yuan

One day, Aunt Wang also sold two pieces of clothes at the price of 180 yuan. One of them lost 20% after the season, and the new one earned 20%?

Cost of one piece out of season: 180 (1-20%) = 225
The cost of a newly listed product is 180 (1 + 20%) = 150
225+150-180x2=375-360=15
15 yuan

Aunt Li sold 2 sets of electric fans at 240 yuan each. One of them made 20% and the other lost 20%. Are the two fans losing money or making money?

Sales: 240 [yuan] × 2 [sets] = 480 [yuan]
Cost: 240 (1 + 20%) [earned 20%] + 240 (1-20%) [lost 20%] = 500 [yuan]
Therefore, 500 yuan - 480 yuan = 20 yuan, losing money

In the plane rectangular coordinate system, it is known that the parabola passes through the point a (0,4) B (1,0) C (5,0), the symmetry axis of the parabola intersects with the X axis at M. (1) the analytical formula of the parabola is obtained
(2) Let p be a point on the parabola (x ＞ 5). If the length of the quadrilateral with a, O, m, P as the vertex is four continuous positive integers, please write the coordinates of P directly
(3) Connect AC and explore whether there is a point n on the parabola below AC to maximize the area of △ NAC? If there is, please find out the coordinates of point n. if not, please explain the reason

(1) According to the known conditions, the analytic formula of parabola can be set as y = a (x-1) (X-5), and the point a (0,4) can be substituted into the above formula to get: a = 45, y = 45 (x-1) (X-5) = 45x2-245x + 4 = 45 (x-3) 2-165, the symmetry axis of parabola is x = 3, and the coordinates of point P are (6,4)

What is the density of iron in kilogram per cubic meter

Pure iron has silver white metallic luster, soft quality, good ductility and ductility. Its density is 7.86 g / cm3 (7860 kg / m3), melting point is 1535 ℃, boiling point is 2750 ℃. Iron is a conductor of electricity and heat

The addition and subtraction algorithm of integral

Addition and subtraction of integers:
In addition and subtraction of several integers, each integer is usually enclosed in brackets and connected by an addition and subtraction sign
(i) If you encounter brackets, remove the brackets first according to the rule of removing brackets: before the brackets is the "ten" sign, remove the brackets and the "+" sign in front of them. All items in the brackets are the same sign, before the brackets is the "one", remove the brackets and the "one" sign in front of them. All items in the brackets change the sign
(II) combination of similar terms: the coefficients of similar terms are added together, and the result is regarded as the coefficient. The index of letters and letters is unchanged

How to judge the positive and negative of the surface integral of coordinates

Look at the right coordinates:
If the integral of X and y, then the upper side of the surface is positive and the lower side is negative;
If we integrate X and Z, then the right side of the surface is positive and the left side is negative;
If we integrate y and Z, then the front side of the surface is positive and the back side is negative
Pithy formula: up positive and down negative, front positive and back negative, right positive and left negative

What is the rate of advance between volume units

The rate of advance between volume units is 1000
1dm³=1000cm³
1m³=1000dm³

(a + 2C-B) (a-b-2c) detailed steps

A: use the square difference formula
(a+2c-b)(a-b-2c)
=(a-b+2c)(a-b-2c)
=(a-b)²-(2c)²
=a²-2ab+b²-4c²

Given that the distance between a (- 2,3) and the focus of parabola y ^ = 2px (P > 0) is 5, find P

The focus is f (P / 2,0)
So AF = (P / 2 + 2) & 178; + (3-0) & 178; = 5 & 178;
(p/2+2)²=16
p/2+2=±4
p>0
So p = 4

To buy the same cloth, Aunt Zhang bought three times as many meters as Aunt Li, so she paid 32.8 yuan more. How much did Aunt Zhang and Aunt Li each pay