Sixth grade Chinese Supplementary words + sentence making Complete the following words and choose 2-3 words to write a paragraph () winter () moon wind () frost () silver () element () spirit () Qi () but not () Before () after ()

severe winter
the wind cuts like a knife and the frost bites into one 's flesh like a sword
Plain wrapped in silver
refreshed
Specialized but not refined
After a long time
At this time, it's cold winter and snowy. It's a scene of plain clothes. Although it's cold, outdoor sports can still make people feel refreshed

As if nothing had happened, he knew it like the palm of his hand and was incomparable. He stood out from the crowd and was astonished
Make sentences!

He looked at the teacher innocently
I know all the famous sayings at home and abroad
The 2008 Olympic Games is undoubtedly an incomparable visual feast
His handsome appearance stands out from the rest of the crowd
The treasures in the Palace Museum of our country are amazing
The lakes are dotted with islands, with mountains rising from the water
Countless beautiful scenery slowly came into my eyes, which made me relaxed and happy

What form should the derivative of F (1-2x) be? The derivative of F (x) is replaced by F (x) '

[f(1-2x)]`=f`(1-2x)*(1-2x)`=-2f`(1-2x)

As shown in the figure, the cross section of the tunnel is composed of parabola and rectangle. The area of the rectangle is 8 meters and the width is 2 meters. Parabola can be used
Y = - 1 / 4x squared + 4
(1) A truck is 4 meters high and 2 meters wide. Can it pass through the tunnel?
(2) If there are two lanes in the tunnel, can the truck pass through?
(3) For the sake of safety, how much do you think the tunnel height should be limited? Why?
Unable to upload map. Sorry
It's a rectangle with an opening, and the downward parabola just falls on the x-axis

1) The length is 8 meters, that is, the lane width is 8 meters, and the semicircle radius is 4 meters,
The width is a part of the height of the tunnel, which is 2 meters,
Then, when the tunnel is 6 meters high, and when it is a one-way road, the other height is h * H = 4 * 4 - 1 * 1 = 15;
4 < (15 under root) + 2;
So you can;
(2) Two lane, h * H = 4 * 4 - 2 * 2 = 12;
4 < (12 under root) + 2;
So I can live

It is known that the quadratic function f (x) satisfies f (0) = 0, f (x + 1) = f (x) + X + 1, G (x) = 2F (- x) + X. (1) the expression of F (x) and (2) the expression of f [g (x)]

Given that one root of the equation x ^ 2-15 / 4x + M = 0 is the square of the other root, then M=

Let one root be a, then the other root be a ^ 2
There are: a + A ^ 2 = 15 / 4
4a^4+4a=15
(2a+1)^2=16
2A + 1 = 4 or - 4
A = 3 / 2 or - 5 / 2
M = a * a ^ 2 = a ^ 3 = 27 / 8 or - 125 / 8

Know the value of A1 and A4, want to calculate the number of A2 and A3 (for example, A1 is 2, A4 is 8, A2 is 4, A3 is 6) how to calculate this

Since there are four numbers A1, A2, A3 and A4, the value of A4 △ 4 = one time quantity a1 + (1 × one time quantity) = A2 a1 + (2 × one time quantity)=
A3. For example, if A1 is 2, A2 is 2 + (1 × 2) = 4 (double quantity is 8 △ 4 = 2) and A3 is 2 + (2 × 2) = 6

In △ ABC, ∠ ACB = 90 ° and ∠ BAC = 30 °, both △ abd and △ ace are equilateral triangles, and DF ⊥ AB is equal to F
(1) To prove: AC = DF (2) connects de with ab at the point, what is the relationship between △ ADM and △ AEM area, and prove the conclusion

1) ∵ AB = dB, ∵ cab = ∵ FDB, two right angles, OK!
2) It has been proved that DF = AC, DF = AE, the bottom and height of the two triangles are equal respectively, and the area is equal thank you!

What is 1-2 of A-3

a-1/3-1/2
=a-5/6

On the left is the plan of the playground of the experimental primary school. The playground is 150 meters long and 60 meters wide. The width measured on the map is 1.5 cm, and the scale is 0 meters
Please hurry up

60m = 6000cm, 150m = 15000 cm
The scale is 1.5/6000 = 1:4000
On the picture, the length is 15000 / 4000 = 3.75cm

Sixth grade Chinese Supplementary words + sentence making Complete the following words and choose 2-3 words to write a paragraph () winter () moon wind () frost () silver () element () spirit () Qi () but not () Before () after ()