문제 4선택형202020202020202020202020202020202020202020202020202020202020202020202203030303030303030303030303030303032020202020202020202020202020
문제 5선택형다음 중 이차 방정식의 일반형은 무엇인가요?ax + b = 0ax^2 + bx + c = 0ax^3 + bx^2 + cx + d = 0ax^4 + bx^3 + cx^2 + dx + e = 0