1. According to the meaning of the question, 3 = A-B+C3 = A+B+C8 = 4A+2B+CA = 5/3B = 0C = 4/3 is used to solve equations.
The equation is y = (5/3) x 2+4/3.
2. According to the meaning, -B/2A=- 1, (4ac-b2)/4a = 9-8 = 0 * a+0 * b+c = ca =-18b =-36c =-8.
The equation is y =- 18x 2-36x-8.
Similar to the second question, there is no solution here.
4. Similar to the first question,