Fish plural

Fish or fish are right

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1. Fish plural
2. On the complex number of fish I remember n years ago when fish was said to be an uncountable noun, isn't that right? It should be a singular plural word, right? But what I doubt is that there is a problem .There __ fish in the lake . The answer is is, I am very confused, and there is another question in the book. What's your opinion? I hope the answer is wrong
3. Is fish plural? Besides fish on the table, is fish plural? Can you say: "there are many fishes in my home"? People on the third floor, but sheet also has a plural. The plural of sheet is itself
4. Is fish plural?
5. How to prove that a real matrix is similar to an upper triangular matrix over a complex field, and give a proof (not Jordan matrix)
6. Let a and B belong to n-dimensional matrices over complex field, a and B are commutative, that is, ab = ba. It is proved that the eigensubspace of a must be the invariant subspace of B
7. Plural proof, It is proved that cos (z1 + Z2) = cosz1 * cosz2-sinz1 * sinz2
8. Solving a complex geometry problem Given three complex numbers Z1, Z2 and Z3, if Z1 ^ 2 + Z2 ^ 2 + Z3 ^ 2-z1z2-z1z3-z2z3 = 0, it is proved that the triangle with Z1, Z2 and Z3 as vertices is regular triangle
9. If the point of complex number (a + I) 2 in the complex plane is on the negative half axis of Y axis, then the value of real number a is () A. 1B. -1C. 2D. -2
10. The complex number Z = M2-1 + (m2-m-2) I is: (1) real number; (2) imaginary number; (3) pure imaginary number
11. Let the complex Z satisfy ZZ - + (2-I) Z + (2 + I) Z - + 4 = 0, and prove the distance from the point corresponding to Z on the complex plane to the point corresponding to complex - 2-I on the complex plane constant Z - is the conjugate complex number of Z, which is convenient to type
12. In the complex plane, the distance from the point corresponding to the complex number 1 + 2I to the origin
13. The distance from the corresponding point of complex number 1 + 1I in the complex plane to the origin is () A. 12B. 22C. 1D. 2
14. Let | Z | denote the distance from the point corresponding to complex Z in the plane to the origin. Given | Z | = 2 + z-4i, find complex Z
15. The discovery and origin of mathematical knowledge, and make a brief introduction and elaboration
16. The origin of mathematical knowledge is less than 50 words
17. The origin of mathematical knowledge Mathematics, like other branches of science, is a kind of intellectual accumulation developed through human social practice and production activities under certain social conditions. Its main content reflects the quantitative relationship and spatial form of the real world, as well as the relationship and structure between them. This can be confirmed from the origin of mathematics The Nile River in ancient Africa, the Tigris River and Euphrates River in Western Asia, the Indus River and Ganges River in central and South Asia, and the Yellow River and Yangtze River in East Asia were the birthplaces of mathematics. Because of the need of agricultural production, the ancestors of these areas used to control floods and irrigation, measure the area of fields, calculate the volume of warehouses, calculate calendars suitable for agricultural production, and calculate related wealth We have accumulated rich experience in long-term practice, such as calculation, product exchange and so on, and gradually formed corresponding technical knowledge and related mathematical knowledge
18. The discovery and origin of mathematical knowledge To be brief, no more than 50 words 2. What kind of diseases are easily caused by insufficient oxygen and dirty air A. Respiratory system B, blood circulation system C, digestive system D, nervous system 3. Brazil and Australia are in the forefront of the world in terms of mineral resources, reserves and production
19. Change these sentences into simple and plural ones 1.These are my parents. ______ _______ _______ my____ 2.That boy is my sister‘s friend _______________ _________ are my sister's friend
20. Give me five plural sentences