To solve the equation x square-4x = 5 = 0 in complex set

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• 1. If the solution of the equation A / 3-2x = 4-A about X is larger than that of the equation a (X-10) = x (A-20), the value range of a is obtained If the solution of the equation A / 3-2x = 4-A about X is larger than that of the equation a (X-10) = x (A-20), the value range of a is obtained Please.
• 2. Equation 5x-4x = 0 a, has only one solution. B, has countless solutions. C, has no solution
• 3. Given the equation (5x + 10) / 8 = X-1, what is the solution of this equation?
• 4. Given a = x & # 179; - 5x & # 178;, B = x & # 178; - 11x + 6, find: 1. A + 2B; 2. When x = - 1, find a + 5B
• 5. Solution of higher order equation X^4+8X-48=0
• 6. If you know one of the solutions of higher order equation of one variable, is there a simple way to find other solutions? For example: X & # 179; + X & # 178; + x-3 = 0, it is obvious that x = 1 is one of the solutions. Is there a simple way to find the other two solutions
• 7. What is the synthetic method for solving higher order equations of one variable? Such as the title
• 8. It is known that the lengths of the two right angles of a right triangle are exactly the two roots of the square of the equation x-3x + 2 = 0. Find: (1) the sum of the lengths of the two right angles of the right triangle; (2) the area of the right triangle
• 9. Given that x 1 and x 2 are two positive integer roots of the equation x 2-m x + 5 (m-5) = 0, and x 1 + x 2 = 7, find the value of M
• 10. Given that x = - 1 is a root of the equation 2x ^ 2 + ax-a ^ 2 = 0 about X, then a =? Why can't we use Veda's theorem
• 11. Factoring x ^ 4 + 4 in complex number
• 12. Solving equations 2x + y = - 2 - 2x + 2Y = - 10 by addition and subtraction
• 13. 4x-40=2/5(3x+40)
• 14. (X-2) (x-3) - 3 (x ^ 2-7x + 13) where x = 7 / 2
• 15. In order to prepare for Xiaoming's college tuition of 20000 yuan, his parents took part in the education savings when he was in the seventh grade. They prepared to save a part of the money first, and then borrow a part of the money when he was in the University. Xiaoming's parents saved a six-year loan with an annual interest rate of 2.88%, and the loan when he was in the University was to be paid off in 10 years, with an annual interest rate of 6.21%, 50% of the loan interest is subsidized by the government. If the interest obtained from participating in the education savings is equal to the interest indicated in the application for the loan, how much money did Xiao Ming's parents spend to participate in the education savings? How much money are they going to make? (there is no interest tax on education savings)
• 16. A number plus 20 percent is 7.2. Find the number
• 17. Solve by equation or formula A and B start from ab at the same time and go opposite each other. When they meet, they are 8 kilometers away from the midpoint of ab. it is known that the speed of a is five sixths of that of B. how many kilometers is the distance between AB and ab?
• 18. Factorization and quadratic equation of one variable 1、 Factorization 1.x^3-6x^2+12x-8；2.(x^2+y^2)-4x^2y^2；3.6x^2+7x+2；4.x^4-6x^2-8；5.x^2-(4a-1)+3a^2-a；6.ab-1+a-b；7.6x^n+1-14x^n+8x^n-1；8.(x^2+3x)^2-2(x^2+3x)-8；9.a^2+b^2-2ab-2b+2a+1；10.ax^2+3x-c=ax=x^2(a≠1)；11.abx^2-a^2x=b^2x-ab(ab≠0) 2、 Discriminant of the root of quadratic equation with one variable and Weida's theorem 1. By using the relationship between and coefficient, we can find the sum of squares and reciprocal of the quadratic equation 2x ^ 2 + 3x-1 = 0 2. The real roots of the equation x ^ 2-ax + B = 0 when a ^ 2 < 4B 3. Given the equation x ^ 2 + (2m + 1) x + (m-2) ^ 2 = 0 about X, what is the value of M (1) the equation has two real roots that do not want to be equal (2) the equation has two equal real roots (3) the equation has no real roots I know that I have a lot of questions and give few points. I can do one thing at a time, The tenth one is ax ^ 2 + 3x-2 = ax + x ^ 2 (a ≠ 1). Sorry to make a mistake
• 19. What's 7 to 5 = 14 to x
• 20. Subtract 2 / 5 of what number from 125, the difference is 5, find this number? (use equation)