放物線 y=2×2−8x+7 https://ja.wolframalpha.com/input?key=&i=%E6%94%BE%E7%89%A9%E7%B7%9A+y%3D2x2%E2%88%928x%2B7 y=2×2−8x+7 https://ja.wolframalpha.com/input?key=&i=y%3D2x2%E2%88%928x%2B7
放物線 y=2×2−8x+7
https://ja.wolframalpha.com/input?key=&i=%E6%94%BE%E7%89%A9%E7%B7%9A+y%3D2x2%E2%88%928x%2B7
y=2×2−8x+7
https://ja.wolframalpha.com/input?key=&i=y%3D2x2%E2%88%928x%2B7