Go to the seaside for the first time to write or describe the sea

Go to the seaside for the first time to write or describe the sea

1. Kong and the sea fall in love, but they can't hold each other's hands, and the love can't continue. The sky cries, and the sea's eyes are wet. So she said: there is a boundary that can never be crossed! 2. The sea is the mother of life; the sea is the baptism of life; facing the sea, bathing in the sea wind, and feeling thousands of Customs in the world of mortals is a big part of life

Composition on going to the seaside
Yes

Go to the seaside
Today, sunny, cloudless, my parents and I came to the seaside with happy mood
When we got to the seaside, the first thing we did was to watch the sea view. The sea here was like a rainbow, sparkling, and the water rushed to the shore one by one like naughty children. After a while, we decided to play in the water. My father and I put on swimming trunks, and my mother put on upstream swimsuit, so we started to move. My father and I were vanguards, and my father rushed down, and saw a large number of waves coming, Dad was made wet, I also went down, I took dad's hand, step by step carefully went down, at this time, my mother also caught up, this is much more interesting. Another wave, my parents and I were washed back to the shore, more terrible in the back. We once again launched a "challenge" to the waves, we ran down, only to see that this wave is much more terrible than the previous wave, The waves splashed down from our heads, and my parents and I were drowned
After enough trouble and tired of playing, we decided to go to the seaside restaurant to eat seafood. The delicacies here are very delicious. They are all artificially raised from the sea. We ordered the dishes and ate with relish. There are Baogong fish, big conch and so on. When we were full, we went home happily
It turns out that the seaside is so interesting. I want to study hard and discover the mystery of the sea

If sin ^ 3 α - cos ^ 3 α ≥ cos α - sin α, 0 ≤ α < 2 π, the value range of angle α is ()
A.[0,π\4]
B.[π\4,π]
C.[π\4,5π\4]
D.[π\4,3π\2]

Select [C. [π - 4,5 π - 4]] (sin α) ^ 3 - (COS α) ^ 3 = (sin α - cos α) ((sin α) ^ 2 + sin α * cos α + (COS α) ^ 2) = (sin α - cos α) (1 + sin α * cos α) (sin α) ^ 3 - (COS α - sin α) = (sin α - cos α) (2 + sin α * cos α) ≥ 0 ∵ 2 + sin α * cos α = 2 + Si

The construction site uses 3 / 2 tons of cement in two days, and the second day uses 2 / 3 of the first day. How many tons are used in two days? (first, the equation solution, then the proportional solution

Suppose that 2x tons are used in the second day, then 3x tons are used in the first day. According to the known conditions, we can get the following solutions: x = 0.3, 3x = 0.9, 2x = 0.6. The first day: the second day = 3:2. The first day accounts for 3 / 5, the second day accounts for 2 / 5. The first day + the second day = 1.5. The first day = 0.9, the second day = 0.6

Natural number 4N + 2 cannot be expressed as the square difference of two natural numbers

Obviously, the proof is as follows: anyway, the natural number 4N + 2 can be expressed as the square difference of two natural numbers, where n is the natural number, then 4N + 2 = A2-B2 = (a + b) (a-b). Since the left formula is even, a + B and A-B are originally odd and even, so a + B and A-B are even, and their product A2-B2 = (a + b) (a-b) is a multiple of 4, while 4N + 2 is only a multiple of 2 (or more than 2 except 4)

The coin 3 of cement yellow sand stone is 2:3:5. If there are 120 tons of cement, how many tons of yellow sand stone are needed to make this kind of standard concrete?

120 / (2 + 3 + 5) = 12 cement = 12 * 2 = 24 yellow sand = 12 * 3 = 36 stone = 12 * 5 = 60

It is known that the function FX. X belongs to R. if FA + B equals FA + FB for any real number a and B, it is proved that FX is an odd function
Seeking ideas

Take a = b = 0 to get f (0) = 0, take a = x, B = - x to get f (x) + F (- x) = 0, so f (- x) = - f (x), so it is an odd function

There are 150 people in the first workshop of the clothing factory, which is 57% of the number in the second workshop. The number in the two workshops is just 67% of the total number of workers in the whole factory. How many workers are there in the whole factory?

A: there are 420 workers in the factory

Given that X and y are r positive and satisfy X / 3 + Y / 4 = 1, find the maximum value of XY
How to solve with basic inequality

The solutions X and y are positive R and satisfy X / 3 + Y / 4 = 1
So 1 = x / 3 + Y / 4 > = 2 √ X / 3 * y / 4 = 2 √ XY / 12
(√XY/12)

How many ways are there to choose six teams from five male and four female athletes, half male and half female?

Half men and half women, three men and three women
Choose three from five men, there are 10
There are four ways to choose three from four women
There are 10 × 4 = 40 species