Write an 80 word English composition according to the weather in my hometown and what people like to do in each season My hometown is in Dalian. I will use it tomorrow

Write an 80 word English composition according to the weather in my hometown and what people like to do in each season My hometown is in Dalian. I will use it tomorrow

There are four seasons in a year. They are spring, summer, fall and winter

A mathematics problem of the second grade of junior high school about inverse proportion function~~~~~~~~~~~~
（14） 18. Given the intersection of straight line y = KX (k > 0) and hyperbola y = 4 / X and two points a (x1, Y1) and B (X2, Y2), find the value of 2 (x1y2) - 7 (X2, Y1). (please write down the process of solving the problem, thank you.)

If the hyperbola is centrosymmetric with respect to the origin, X1 = - X2, Y1 = - Y2
From y = 4 / x, xy = 4
∴2（x1y2）-7(x2y1)=-2x1y1+7x1y1=5x1y1=5xy=20

The bottom area of a cuboid is 24 square centimeters, the perimeter of the bottom surface is 20 centimeters, and the height is 7 centimeters. How many square centimeters is the surface area of the cuboid

Let the rectangle be xcm in length and YCM in width
x+y=20/2
Xy = 24, x = 6, y = 4
Surface area = 6 * 4 * 2 + 6 * 7 * 2 + 4 * 7 * 2 = 48 + 84 + 56 = 192 square centimeter

cos(pai/4+x)=3/5,17pai/12

From cos (PAI / 4 + x) = 1 / √ 2 (cosx SiNx) = 3 / 5
cosx-sinx=3√2/5 ①
If 1-sin2x = 18 / 25, then
sin2x=7/25 ②
From 17 π / 12

Given the set a = {x | X & # 178; - 2x-3 ≤ 0}, B = {x | X & # 178; - 2mx + M & # 178; - 4 ≤ 0, X ∈ R, m ∈ r}
The known set a = {x | x ﹥ 178; - 2x-3 ≤ 0}, B = {x | x ﹥ 178; - 2mx + m ﹥ 178; - 4 ≤ 0, X ∈ R, m ∈ r}
Find (1) a ∩ B = [0,3] find the value of real number m (2) if a is a subset of the complement of B, find the value range of real number M

Set a is the solution set of inequality: X & # 178; - 2x-3 ≤ 0, and set B is the solution set of inequality: X & # 178; - 2mx + (m-2) (M + 2) ≤ 0, that is: [x - (m-2)] [x - (M + 2)] ≤ 0 ∩ B = {x | m-2 ≤ x ≤ m + 2} (1) if a ∩ B = [1,3] ∩ m-2 = 1 and M + 2 ≥ 3 ∩ M = 3 (2) if a is contained in C

If a function passes through (- 1,2) and the value of function y increases with the increase of independent variable x, please write a function relation that meets the above conditions______ ．

∵ if a function passes through (- 1,2) and the value of function y increases with the increase of independent variable x, ∵ if it is determined to be a linear function, then k > 0, and after (- 1,2), the answer is not unique, ∵ there are many functional relations that meet the above conditions, for example: y = x + 3

2 times of the sum of X and 6.8 is 20. Solve the equation of X

2(x+6.8)=20
x+6.8=10
x=10-6.8
x=3.2

The elliptic equation with the same focus as the ellipse 9x2 + 4y2 = 36 and the minor axis length of 45 is ()
A. x225+y220＝1B. x220+y225＝1C. x220+y245＝1D. x280+y285＝1

Ellipse 9x2 + 4y2 = 36, C = 5, the focus of ellipse is the same as that of ellipse 9x2 + 4y2 = 36, the half focal length of ellipse is C = 5, that is, A2-B2 = 5, the length of minor axis is 45, B = 25, a = 5, the standard equation of ellipse is x220 + y225 = 1, so B is selected

A number minus its & nbsp; 25 equals 1.44. What's the number? ．

1.44 (1-25) = 1.44 (35) = 2.4; a: this number is 2.4

Cos equals 0.575. What's the angle

The angle is 54.9 degrees