It is known that the linear equation AX = B has two different solutions X1 and x2. There must be innumerable solutions to prove this equation

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• 1. Buy a transformer for the electric welding machine, and turn the household electricity from 220 V to two-phase 380 v. how to calculate the power of the electric welding machine? Rated output current 300A, rated input voltage 380 / 220, rated frequency 50Hz, rated input capacity 21.6KVA, no-load voltage 60V, rated load duration rate 20%, rated load voltage 32, current regulation range 90-300, can you make a transformer only for welding machine? I don't know very much. What kind of transformer do you want to make? What are the specific parameters?
• 2. General division 1 / X & # 178; - 4 and X / 4-2x X / (x-1) & # 178; and 1 / X & # 178; - 1
• 3. Does the filament of an electric lamp change with temperature? Is the resistance large or small when it is just turned on?
• 4. Given x + 1 / x-3 = 0, find the value of 1 / x ^ 4 + 1 / x ^ 2 + 1 + x ^ 2 + x ^ 4 Given x ^ 2 / y ^ 2-4x / y + 4 = 0, find the value of fraction x ^ 2-y ^ 2 / XY
• 5. This problem is factorized by undetermined coefficient method? x^4-x^3-5x^2-6x-4 Let x ^ 4-x ^ 3-5X ^ 2-6x-4 = (x ^ 2 + ax + b) (x ^ 2 + CX + D) =x^4+(a+c)x^3+(ac+b+d)x^2+(ad+bc)x+bd It can be concluded that a+c=-1, ac+b+d=-5, ad+bc=-6, bd=-4． How to solve a B C
• 6. On a problem of factorization with undetermined coefficients Use undetermined coefficient to decompose a pentanomial, and then you can get a series of equations. How do you want to solve this equation? a+c=-1 d+ac+b=-27 ad+bc=-44 bd=7
• 7. Factorization 8 + x ^ 3 △ 27 For example, x ^ 3 / 27 should be in the form of fraction
• 8. Solving a cubic equation of one variable 3 times of X - 2 times of X - 2x = 0 Find x
• 9. How to solve the cubic equation of one variable?
• 10. How to solve cubic equation of one variable
• 11. As shown in the figure, it is known that the numbers a, B and C corresponding to points a, B and C on the number axis are not 0, and C is the midpoint of ab. if [a + b] - [a-2c] + [b-2c] - [a + b-2c] =0, then the position of origin 0 is () A. On line AC, B. on line Ca, C. on line BC, D. on line CB Is the absolute value sign
• 12. Calculation (- 2000 6 / 5) + (- 1999 3 / 2) + 4000 4 / 3 + (- 1 2 / 1) fast
• 13. Take AC BC of △ ABC side as square respectively, AbfG and ACDE connect Ge. If the extension line of OA with o as the midpoint of EG intersects BC at h, explore the following problems: (1) s △ ABC = s △ AEG (2) BC = 2ao (3) ah ⊥ BC (4) connect FD. If M is the midpoint of FD, Mn ⊥ BC in N, try to explore BC = 2Mn
• 14. Factorization (1) 2a2b + 4ab-6b (2) 16x4-8x2y2 + Y4
• 15. If sample X1 + 1, X2 + 1 For samples X1 + 2, X2 + 2 The following conclusion is correct () A. The mean is 10 and the variance is 2B. The mean is 11 and the variance is 3C. The mean is 11 and the variance is 2D. The mean is 12 and the variance is 4
• 16. Of all the natural numbers from 1 to 2006, how many times 72 are perfect squares? I know the answer is 31, but I don't know how to get the result
• 17. Known vector group I: A1, A2, A3; II: A1, A2, A3, A4; III:a1 If the rank of each vector group is R (I) = R (II) = 3, R (III) = 4, it is proved that vector group IV: A1, A2, A3, a5-a4 are linearly independent
• 18. 2X of 0.6 is equal to 0.9 of 3 to solve the equation
• 19. In the plane rectangular coordinate system, if the point (x.y) is translated a unit length to the left, and then B unit length to the down, the result is ()
• 20. 1. Four fifths of the total length of a road has been built, and what percentage of the road has not been built? 2. The Yellow river steamer sails from port a to port B. the journey between the two ports is 120 kilometers. The distance that has been sailed is one fifth of the remaining distance. How many kilometers is this freighter away from port B 3. The kilogram of an orange is 2 / 3 of that of an apple, and that of a banana is 1 / 2 of that of an orange