Make sentences! This is a Because there are . handsome girl help! Make whatever you want!

Make sentences! This is a Because there are . handsome girl help! Make whatever you want!

This is a comfortable and natural land, because it has charming natural scenery and hardworking and simple son of the earth, which interprets the true meaning of human society

Spring, light rain, field, willow, grass, dream, kite, flower, cozy, longing how to make sentences?

Spring is coming, the rain moistens the willows and everything. The grass also stretches its waist, no longer dreaming
The children's kites and laughter are flying in the fields. The flowers welcome the drizzle and yearn for more dazzling beauty
Take it, pro. It's not easy

It is known that the parabola y = ax & # 178; + BX + C passes through (- 1,0), (0, - 3) (2, - 3) three points
Find the expression of this parabola
Write the opening direction, symmetry axis and vertex coordinates of the parabola

Take these three points into a parabola
obtain
a-b+c=0
c=-3
4a+2b+c=-3
Because C = - 3
So formula one A-B = 3
4a+2b=0
That is, formula 2A + B = 0
Formula One Plus Formula Two
a=1,b=-2
So the analytic formula is y = x ^ 2-2x-3 = (x-1) ^ 2-4
According to the analytic formula, a > 0, opening upward, symmetry axis X = 1, vertex coordinates (1, - 4) are obtained
If you don't understand,

How many kilograms is one cubic meter of diesel?

The density of oil products will change with the change of air pressure and temperature, and will also be affected by the quality of oil products. Generally, the standard density of diesel oil is about 0.86, that is to say, one liter of diesel oil is about 0.86 kg, then one cubic meter is about 860 kg. Generally, the conversion of annual average volume and mass of diesel oil in Jiangnan area is 0.8621, that is, one liter of diesel oil is 0.8621 kg, On the contrary, 1kg diesel is about 1.16l, so the standard diesel is 860kg

Polynomials divided by monomials~
1, using the multiplication formula to calculate: [(a-b) & sup2; + 4AB] / (a + b) & sup2;
2,(a^4-b^4)/(a+b)/(a^2+b^2)
3,(6a^n+3+12a^n+2-3a^n)/3a^n-2

What is the difference between Green's formula and the second kind of curve integral?

When the integral curve of the second kind of curve integral is a closed curve, and the partial derivatives of Q (x, y) and P (x, y) exist in the plane region surrounded by the closed curve, Green's formula can be used to calculate the second kind of curve integral,

The progression between two adjacent volume units is ()
A. 10B. 100C. 1000D. 10000

The rate of advance between two adjacent volume units is 1000

The multiplication formula (a + b) (a ^ 4-A ^ 3B + A ^ 2B ^ 2-AB ^ 3 + B ^ 4) = a ^ 5 + B ^ 5, (a-b) (a ^ 4 + A ^ 3B + A ^ 2B ^ 2 + AB ^ 3 + B ^ 4) = a ^ 5 + B ^ 5^
utilize
The above formula is decomposed into x ^ 8 + x ^ 6 + x ^ 4 + x ^ 2 + 1, and 100 points will be added to the answer,
At the end of the title is = a ^ 5 + B ^ 5

Let a = x ^ 2, B = 1
The formula changes to:
(x^2-1)(x^8+x^6+x^4+x^2+1)=x^5+1
x^8+x^6+x^4+x^2+1=(x^5+1)/(x^2-1)

One vertex of an equilateral triangle is at the focus of the parabola y ^ 2 = 2px, and the other two vertices are on the parabola

Parabola y ^ 2 = 2px with focus f (P / 2,0)
Let the side length of an equilateral triangle be a, then its height is h = √ 3 / 2 * a
According to the symmetry of an equilateral triangle, the height of its over focus is on the x-axis, and the corresponding bottom edge is perpendicular to the x-axis, then the side length is the distance between the two intersection points of the edge and the parabola
The intersection of the bottom edge and the x-axis is (P / 2 - √ 3 / 2 * a, 0)
Substituting into the parabolic equation, y ^ 2 = 2p (P / 2 - √ 3 / 2 * a), that is, y ^ 2-2p (P / 2 - √ 3 / 2 * a) = 0
For this equation, Y1 + y2 = 0, y1y2 = - 2p (P / 2 - √ 3 / 2 * a)
∴a=|y1-y2|=√[(y1+y2)^2-4y1y2]=√[4*2p(p/2-√3/2*a)]
∴a^2=8p(p/2-√3/2*a)
The solution is a = (4-2 √ 3) P (negative root abandonment)
The side length of an equilateral triangle is (4-2 √ 3) P

There are 500 grams of 80% alcohol solution. How many grams of 50% alcohol solution are added to make 75% alcohol concentrate?

Suppose you need to add 1 / 5 alcohol x kg
（160+x)*3/10=160*4/5+x*1/5
X = 800 kg