32 = () - () prime numbers in brackets

32 = () - () prime numbers in brackets

32=37-5
Hope to adopt

Fill in the following brackets with the appropriate prime number 14 = () + () = () - () = () * ()
emergency

14=(3)+(11)=(17)-(3)=(2)*(7)
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() + () = 30 prime numbers in brackets

7+23
11+19
13+17

100 = () + () prime numbers in brackets

100=( 97)+( 3) =（89)+(11)=(83)+(17)=(71)+(29)=(59)+(41)=(53)+(47)

The circumference of a semicircle is 30.84cm. What is the radius of the semicircle?

Circumference of semicircle
=Circumference △ 2 + diameter
=3.14 × radius + radius × 2
=Radius × (3.14 + 2)
therefore
Radius of semicircle = circumference of semicircle (3.14 + 2)
30.84÷（3.14+2）
=30.84÷5.14
=6 (CM)

Volume formula of regular quadrangular prism

Bottom area * height,
For example, the side length is L
Then the volume of L is cubic

sin180/16*cos180/16*cos180/8*cos180/4＝?

sin180/16*cos180/16*cos180/8*cos180/4 =1/2*(2sin180/16*cos180/16)*cos180/8*cos180/4 =1/2*sin180/8*cos180/8*cos180/4 =1/2*1/2*(2sin180/8*cos180/8)*cos180/4 =1/4*sin180/4*cos180/4 =1/4*1/2*(2sin180/4*co...

Sum: SN = 1 * 2 + 1 * 2 ^ 2 + 3 * 2 ^ 3 + +n*2^n.

Sn=1*2+2*2^2+3*2^3+…… +n*2^n (1) 2Sn= 1*2^2+1*2^3+3*2^4+…… +n*2^(n+1) (2) (1)-(2) -Sn=1*2+1*2^2+1*2^3+…… +1 * 2 ^ N-N * 2 ^ (n + 1) = 2 (2 ^ n-1) - n * 2 ^ (n + 1) so Sn = (n-1) * 2 ^ (n + 1) + 2

A sentence with a dash indicating a supplementary statement

Dash is a widely used label. Its main usage can be summarized as follows
For example, "the Asian continent has the highest mountain system in the world - Himalayas, and the highest mountain on the earth - Mount Everest."
Parentheses also indicate explanatory notes, but the explanatory notes caused by dashes are part of the text, which are more important information and should be read out. The explanatory notes in parentheses are not the text, but notes. Without them, the integrity of the sentence will not be affected, and it is not necessary to read them along with the text
For example, "except for the nine major planets Mercury, Venus, earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto in the solar system, There are also 40 satellites and a large number of asteroids, comets and meteoroids. "Intuition - though it's not always reliable - tells me what might be wrong with this."
For example, "my company in Zhuhai is doing very well. My boss is very nice to me, and my salary is very high. It's more than 3000 yuan a month! -- can I have a cigarette?" before the dash, I told about myself, then suddenly turned to ask the other party something else
He was very big, and he thought his mother was dead long ago. The dash in the former case means that the following words were not spoken. The latter case means that he broke off for a moment, and then went on after a pause
4. It means the extension of the voice. For example: "Shun - Shan - Dao" -- the young man of our logging company shouts from the woods. "
For example, "in an article entitled on integrity, he summed up the historical road and the current situation of Chinese intellectuals since the May 4th Movement -" the little girl looks like her mother, My heart trembled. The scene of my life in Huaishu village ten years ago appeared again
For example: "in fact, this critic not only lacks the common sense of ancient literature and art, but also does not understand the meaning of common ancient Chinese words. He describes" Zhui "(Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhui, Zhu, "Thorn" is today's business card. It's said to be "holding things with thorns" - it's all groundless nonsense. "
In my experience, this method of distribution is the best in the world. Let's take Lao She as an example. In fact, everyone will come across this one time, he The special component of a sentence is a part of the whole sentence, but it has a structural relationship with other components. It is an independent component. Its position is also flexible. Double dashes lead to parenthesis, not brackets
For example, the relationship between the central and local governments is one of the core issues of the national political and economic system
——The principle of legalization of democratic centralism;
——The principle of legalization of the party's leadership;
——The principle of giving full play to the enthusiasm of the central and local governments;
——The principle of separation of responsibilities between government and enterprise
Used in front of a subtitle
Language and Philosophy
——A comparative study of the philosophical traditions of contemporary Britain, America, Germany and France
9. Used to indicate the author after citation
The river is more red than fire at sunrise, and the river is as green as blue in spring
——Bai Juyi
twenty-nine

It is known that the focus of ellipse is F1 (0, - 1), F2 (0,1), point P is a point on ellipse, and │ F1F2 │ is the equation of finding ellipse by the mean of difference between │ Pf1 │ and │ PF2 │
The second question is the key point of my question. The moving straight line L: y = KX + m has and only has one common point with the ellipse C. the points m and N are two points on the straight line L. f1m is perpendicular to L and f2n is perpendicular to L. find the maximum area s of quadrilateral f1mnf2

(1) C = 1,4c = 2A, a = 2, B ^ = 3, the elliptic equation is y ^ / 4 + x ^ / 3 = 1. ① (2) substituting y = KX + m into ①, 3 [K ^ x ^ + 2kmx + m ^] + 4x ^ = 12, (3K ^ + 4) x ^ + 6kmx + 3M ^ - 12 = 0, △ / 4 = 9K ^ m ^ - (3K ^ + 4) (3m ^ - 12) = - (12m ^ - 36K ^ - 48) = 0, ｜ m ^ = 3K ^ + 4, f1m = | 1 + m | / √ (k ^ + 1), f2n = | M-1 | /