How to write the plural of 65, 80 and 100

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• 1. First observe the calculation process of the first two questions, and then follow the calculation of the second two questions. 9 * 9-1 = 9 * (10-1) - 1 = 9 * 10-9-1 = 90-10 = 80 9*9-1=9 *（10-1）-1=9*10-9-1=90-10=80 98*9-2=98（10-1）-2=980-98-2=980-100=880 987*9-3=（ ） 9876*9-4=（ ）
• 2. (100-100x) ^ 2 + (80-80x) ^ 2 = (10 √ 41) ^ 2 simple calculation （100-100x)^2+(80-80x)^2=(10√41)^2 It is easy to calculate X and explain the reason
• 3. Complex 3-I / (1 + I ^ 2) - 1
• 4. The absolute value of Z + 1 is? (1 + Z is the denominator) if the complex Z satisfies 1 + Z / 1 = I the sooner the better
• 5. On the operation of complex numbers, the numerator is (1-radical 3I) ^ 15 - (1 + radical 3I) ^ 6, and the denominator is (- 1 + I) ^ 12
• 6. As shown in the figure, in △ ABC, the linear equation of the height on the BC side is x-2y + 1 = 0, and the linear equation of the bisector of ∠ A is y = 0. If the coordinates of point B are (1,2), the coordinates of point a and point C are obtained
• 7. If the function y = 2sinx + acosx range [- 3,3], then what is a equal to?
• 8. Let 3 ^ a = 4 ^ B = 36. Then what is 2 / A + 1 / b?
• 9. Given f (x) = 1 / 2 (SiNx + cosx) - 1 / 2 absolute value SiNx + cosx, find the range of F (x)
• 10. 1、 The greatest common divisor of 840 and 1764 can be obtained by division 2、 Find the greatest common divisor of 440 and 556 by phase change subtraction
• 11. The imaginary part of complex number (1-I) 2 is______ ．
• 12. Given that the complex Z satisfies z-2|z| = - 7 + 4I, find the complex Z
• 13. The complex number (2 + I) 2 equals () A. 3+4iB. 5+4iC. 3+2iD. 5+2i
• 14. Find the common complex number of velocity, 1,8 + 2i.2,7 - (√ 5) i.3,4i.4,3 / 5
• 15. Can complex operation: (3 + 4I) (1 + I) be calculated by the law of multiplicative distribution 3 × 1 + 3 × I + 4I × 1 + 4I × I?
• 16. If the corresponding points of complex number 3-5i, 1-I, - 2 + AI on the complex plane are on the same straight line, then the value of real number a
• 17. Beginners... According to the definition of the complex number and four operations, the preparation of the complex class 1. Complex number in Mathematics (1) Definition of plural For example, if the discriminant is less than 0, the quadratic equation with one variable still has no solution, so the number set is expanded again to reach the complex range Definition: a number in the form of Z = a + bi is called complex number, where I is an imaginary unit, and I ^ 2 = I * I = - 1 (a, B are any real numbers) We call the real number a in the complex z = a + bi the real part of the imaginary Z, and record it as rez = a The real number B is called the imaginary part of the imaginary number Z, denoted as IMZ = B It is easy to know: when B = 0, z = a, then the complex number becomes a real number; When a = 0 and B ≠ 0, z = Bi, we call it pure imaginary number The set of complex numbers is represented by C. obviously, R is the proper subset of C The complex set is an unordered set, and the size order cannot be established (2) Four algorithms of complex numbers: If Z1 = a + bi, Z2 = C + Di, where a, B, C, D ∈ R, then 　　z1±z2=（a＋bi）±（c＋di）＝（a±c）＋（b±d）i, 　　（a＋bi）•（c＋di）＝（ac－bd）＋（bc＋ad）i, （a＋bi）÷(c＋di)=(ac+bd)/(c^2+d^2) +((bc-ad)/(c^2+d^2))i According to the number of certain and four operations, write the complex class 2、 Requirements and purpose of the experiment 1. Understanding data type definition 2. Write code to realize data class
• 18. Given Z - | Z | = - 1 + I, find the complex Z
• 19. On the plural form, I would like to ask how the exponential form of complex number is derived from Euler formula. Why is the I θ power of e equal to cos θ + isin θ?
• 20. Who has the list of national (singular and plural) languages taught by English speakers?