Answer question 2x-7y = 3,4x + 2Y = - 2

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• 1. 1 / 3 [3Y - (10-7y / 2)] - 1 / 6 [2Y - (2Y + 2 / 3)] = Y / 2-1
• 2. Finding definite integral ∫ X / (x ^ 2 + 3x + 7) DX
• 3. Solving indefinite integral ∫ sin2x × 3 ^ cosx ^ 2 × quadratic root sign (1 + 3 ^ cosx ^ 2 ×) DX
• 4. Given that the vertex of square-2x + m + 1 of the quadratic function y = x is the same as that of square + nx-1 of y = 2x, find the vertex value of M, n?
• 5. If the symmetry axis of the image of quadratic function f (x) is a straight line x = - 2, the intercept of the image on the Y axis is 1, and the length of the line segment cut by the X axis is 22, find f (x)
• 6. As shown in the figure, the image of quadratic function y = x ^ 2 + BX + C passes through a (- 1,0) and B (4,0), intersects with the positive half axis of Y axis at C, and ab = OC (1) Find the coordinates of point C (2) Find the expression of quadratic function, and find the maximum value of function
• 7. Let the minimum value of the quadratic function y = f (x) be 4, and f (0) = f (2) = 6, find the analytic expression of F (x)
• 8. Given the quadratic function f (x), when x = 2, there is a maximum value of 16. The length of the line segment obtained by cutting x-axis of its image is 8 If the quadratic function f (x) is known, when x = 2, it has a maximum value of 16. The length of the line segment obtained by its image cutting the x-axis is 8. The expression of F (x) can be obtained
• 9. Given that the quadratic function y = f (x), when x = 2, it has a maximum value of 16, and the length of the line segment obtained by its image cutting x-axis is 8. We try to prove that the equation f (x) = 0 has two unequal real values (1) It is proved that the equation f (x) = 0 has two unequal real roots, and the two roots are in the interval (- 3, - 1) and (5,7) respectively (2) The zero point of the function is obtained
• 10. Given that the image of quadratic function y = x2 + BX + C passes through point a (C, 0) and is symmetric with respect to line x = 2, the analytic expression of the quadratic function may be______ Just write a possible analytical expression
• 11. The first group of equations: 2x + y = 4,2y + Z = - 3,2z + x = 5, the second group of equations: X / 2 = Y / 3 = Z / 4,5x + 2y-3z = 8 Don't copy it
• 12. Solve the system of equations x = 2 = Y / 3 = Z / 4,5x + 2y-3z = 8, please
• 13. If the two roots of the equation AX ^ 2 + BX + C = 0 (a is not equal to 0) are 1, - 1 respectively, then 2A + C=
• 14. Solve the equation, 2x + 3Y = 1, x-2y = 3, try to judge the sign of the solution
• 15. The root of the equation 2Y ^ 2 = 3Y is
• 16. His father's age is 9 times that of XiaoCong, and his mother's age is 7.5 times that of XiaoCong. His father is 6 years older than his mother, and XiaoCong is a child this year______ I'm 40 years old
• 17. In solving the equation, Xiao Hua, a student of class 2, Grade 7, polluted a constant in the equation and could not see clearly. The polluted equation was 2y-1 / 2= 2y-1 / 2 = 1 / 2Y + [] how to do? Xiaohua thought about it, and then turned to the book to find that the solution is y = 5 / 3, so he made up the constant and finished the assignment. What's the constant? The equation and process and three grams of oil!
• 18. Xiao Ming did a problem of solving equation in his math homework. He accidentally polluted a constant in the equation. He couldn't see it clearly. The polluted equation was 2y-12 = 12Y - ● what should he do? Xiao Ming thought about it and then looked at the answer at the back of the book. The solution of the equation was y = - 53. Xiao Ming quickly made up the constant, which should be () A. 1B. 2C. 3D. 4
• 19. The teacher copied an extracurricular exercise of an equation on the blackboard. The student on duty accidentally erased one of the numbers and made it (2x - *) / 3 - (2x + 1) / 4 = (10x + 2) / 8-1 (*). The math class representative calculated the erased number according to the teacher's answer x = 1 / 6. Please write down the calculation process of the math class representative
• 20. Solution equation: 1.40% x = 24 2. X + one fifth x = 36 3. X-75% x 160 4.50% X-30% x = 18 5.80x-40x = 200 6. X + 120% x = 152 And to be neat! I'm in a hurry! Those are the first questions! Don't get me wrong!