Application of sine theorem and cosine theorem In △ ABC, a, B and C are the opposite sides of angles a, B and C respectively. Let a + C = 2B and a-c = 60 ° to find the value of SINB

Application of sine theorem and cosine theorem In △ ABC, a, B and C are the opposite sides of angles a, B and C respectively. Let a + C = 2B and a-c = 60 ° to find the value of SINB

a+c=2b
cosA+cosC=2cosB
cosA+cosC=2cos[(A+C)/2]cos[(A-C)/2]

Read the passage. Choose the words from the boxes and fill in the blanks. Note that the verbs must be in the past tense. Some of them are used more than once
ask be jump pull have smile walk
He ( ) over to my bed and ( ) in.'Are there any ants here?' he ( ) .'No,Robert,you ( ) a
dream about ants,but there aren't any here.' He ( ) and i ( ) the bedclothes over him .
In twe minutes ,we ( ) both asleep

jumped walked smiled have pulled have
were

What is the relationship between the theoretical system of socialism with Chinese characteristics and Marxist philosophy?

Relationship: the theory of socialism with Chinese characteristics is put forward under the guidance of Marxist philosophy
(1) Materialism in Marxist philosophy: material determines consciousness, everything starts from reality. China's national conditions are the biggest reality, everything starts from China's national conditions, making the subjective conform to the objective, so we must adhere to the road of socialism with Chinese characteristics
(2) Dialectics in Marxist philosophy: contradictions have particularity, so we should insist on concrete analysis of specific problems. China's national conditions have particularity, so we should insist on taking the road of socialism with Chinese characteristics

The resonant frequency of RLC series resonant circuit is ()

1 / (2 * pi * root (LC))

Expounding the foundation and basic principles of historical materialism?

Historical materialism was founded by Marx and Engels. They called it "materialist historical theory" or "materialist historical view"
Historical Materialism: it is a science about the general law of the development of human society and the historical view of the proletariat. Historical materialism holds that the development of social history has its own inherent objective law. It holds that the mode of production of material life determines the general process of social life, political life and spiritual life; social existence determines social consciousness, Social consciousness reacts on social existence; the contradiction between productive forces and relations of production, the contradiction between economic base and superstructure, is the basic contradiction to promote all social development; in class society, the basic social contradiction is manifested as class struggle, which is the direct driving force for the development of class society; the highest form of class struggle is social revolution, The history of social development is the history of the people's practical activities, and the people are the creators of history, but the activities and functions of the people in creating history are always restricted by the economic, political and ideological and cultural conditions in a certain historical stage

English words with ED and ES or s are explained in detail

Adding ed after a word depends on the last sound of the word
1. If the last sound is / T /, / D /, pronounce / ID /, such as sealed / Si: TID /, LED / Li; did /;
2. If the last consonant is a clear consonant, pronounce / T /, such as looked / lukt /;
3. If the last sound is a voiced consonant, pronounce / D /, such as robbed / robd /
1、 The plural of a noun becomes - S
S is pronounced as follows:
1. After the clear consonant, read / S /, for example, K in books is the clear consonant [k], so s sends [S]
2. Read / Z / after voiced consonants and vowels. For example, G is voiced consonant [g] in pigs, so s pronounces [Z]
3. After T and D, read them together with the preceding [t], [D]. For example, cats is [TS], [DZ], [Zi]
4. The words ending with s, SH, CH, x, etc. are read with - ES / iz / bus buses watch watches
5. Change the word ending with consonant + y into I, and then add es to read / Z / Baby --- babies
The ending of e depends on the actual situation
1. Countable nouns like tree, bee, directly add s to trees, bee, where e pronounces the vowel of [I:], so s is [Z]
2. Nuddle (noodles), which is uncountable like this, is directly nuddle in plural
3. There is another kind, such as people, when it is used as "people", it is not countable, and the plural and singular are in the same shape. When it is used as "nation", the plural is people
4. There are some special ones, for example, the plural number of "knife" is "bones". Generally speaking, the plural number at the end of "Fe" is "F" to "V" plus "es". At this time, the pronunciation is "naivz"
6. The words ending with CE, Se, Ze, (d) ge and - s read / iz / license licenses
2、 How to read the verb plus - ed:
The pronunciation of the past tense of regular verbs is also regular. Please remember: after the Qing Dynasty [t], Yuan Zhuo [D], after [t] [D], read [ID]
[k] After [F] [S] [F], ED should read [t]. For example: worked, finished. ② after vowel or voiced consonant [g] [v] [Z] [M], ED should read [D]. For example: live, called. ③ after [t] or [D], ED should read [ID]. For example: started, needed

What is the surface area of a cylinder whose side area is 25.12cm and whose height is equal to the bottom radius
Speed, hurry

The height is equal to the bottom radius, i.e. 2 π R x r = 25.12,
2πr²＝25.12
πr²＝12.56
Surface area = 25.12 + 12.56x2 = 50.24

997 is_______ (prime / composite) and decompose it. The prime factor is__________ .
Think twice before you leap

997 is a prime number and cannot decompose the prime factor

It is known that the circumference of isosceles △ ABC is 10. If the waist length is x, then the value range of X is______ ．

According to the meaning of the question: 10-2x-x ＜ x ＜ 10-2x + X, the solution is 52 ＜ x ＜ 5

The greatest common divisor of natural numbers a and B is 1, the least common multiple (), if a = (), B = (), their least common multiple is ()

The first blank is a * B
two
three
6 (the last three blanks are not unique)