Xiaohua, Xiaojun and Xiaogang bought a basket of apples with the same amount of money. When they divided the apples, both Xiaohua and Xiaojun were 9 kg more than Xiaogang. Therefore, each person had to give Xiaogang 6 yuan?

6 ^ (9 × 2 ^ / 3 ^ / 2) = 6 ^ / 3, = 2 (yuan). Answer: 2 yuan per kilogram of apple

Bivariate linear equations application problem to process, thanks on a problem
1. If a correspondent wants to arrive at a certain place within the specified time, he can walk 15 kilometers per hour, then he can arrive at a certain place 24 minutes in advance; if he walks 12 kilometers per hour, then he will be 15 minutes late?

Suppose that the distance for the correspondent to reach a place is x kilometers, and the original time is y hours
X/15=y-24/60
X/12=y+15/60
The solution of the equations is: x = 39; y = 3
A: the correspondent's journey to a certain place is 39 kilometers; the original time is 3 hours?

A straight line L passes through the point P (4,1), intersects the positive half axes a and B of X axis and Y axis respectively, and O is the origin. The equation of L is obtained when the area of triangle AOB is the smallest

Let the intercept equation of line l be x / A, Y / b = 1, then the coordinates of a are (a, 0), and the coordinates of B are (0, b) | PA | = a, | Pb | = B. because the line passes through point P (1,4), the coordinates of the substitution point are 1 / a 4 / b = 1, and the mean value inequality is 1 ≥ 2 √ [(1 / a) (4 / b)] 1 ≥ 4 √ (1 / AB) 1 / AB ≤ 1 / 16, ab ≥ 16. When 1 / a = 4 / b = 1 / 2, a = 2, B = 8, the equal sign is taken, that is | PA | * | Pb | in a = 2, Take the minimum value when B = 8, then the equation of the line L is x / 2, Y / 8 = 1, and the general formula is y = - 4x 8

The function f (x) = A / 2-A / 2cos (2wx + 2b) (a > 0, w > 0,0) is known

(1) The maximum value of F (x) = (A / 2) - (A / 2) cos (2wx + 2b) is 2, so a / 2 + A / 2 = 2, the solution is a = 2; the symmetry axis of the function satisfies 2wx + 2B = k π, K ∈ Z, that is, the symmetry axis is x = (K π - 2b) / (2W), the distance between adjacent symmetry axes is 2, so π / 2W = 2, the solution is w = π / 4; if (1,2), then 2 = 1-cos (2W + 2b), the solution is B =

Common sayings, proverbs and ancient poems about the Yellow River
Hurry!

Ancient poetry: 1. Li Bai's "will enter wine" has "you do not see, the water of the Yellow River comes up from the sky, runs to the sea never to return" to write the magnificent vision of the Yellow River, which has a long history from the sky to the sea. 2

Take (a-b) as a whole and merge the similar terms: 4 (a-b) 2-2 (a-b) + 5 (a-b) + 3 (a-b) 2=______ ．

4（a-b）2-2（a-b）+5（a-b）+3（a-b）2=4（a-b）2+3（a-b）2-2（a-b）+5（a-b）=7（a-b）2+3（a-b）．

The solution set of inequality ax + BX = 2 > 0 is (- 1 / 2,1 / 3), then A-B is equal to

The solution set of ax & sup2; + BX + 2 > 0 is - 1 / 2

There are several libraries

There are some libraries .

As shown in the figure, the absolute value of a + B - the absolute value of A-B is simplified

Absolute value of a + B - absolute value of A-B = - (a + b) - (a-b) = - A-B-A + B = - 2A

If we know that the function f (x) is a decreasing function in the interval (0, + 00), then the relationship between F (a ^ 2-A + 1) and f (3 / 4) is large,
The answer is f (a ^ 2-A + 1)

Because a ^ 2-A + 1 = (A-1 / 2) ^ 2 + 3 / 4 > = 3 / 4
And f (x) is a decreasing function in the interval (0, + 00),
So f (a ^ 2-A + 1)

Xiaohua, Xiaojun and Xiaogang bought a basket of apples with the same amount of money. When they divided the apples, both Xiaohua and Xiaojun were 9 kg more than Xiaogang. Therefore, each person had to give Xiaogang 6 yuan?