(1) https://www.wolframalpha.com/input?i=+x2+%2B+y2+%E2%88%92+6x+%E2%88%92+4y+%2B+12+%E2%89%A6+0&lang=ja (2) x2 + y2 − 6x − 4y + 12 ≦ 0,2x+1の最大値9 (3) x2 + y2 − 6x − 4y + 12 ≦ 0,x2+y2の最大値 https://www.wolframalpha.com/input?i=+x2+%2B+y2+%E2%88%92+6x+%E2%88%92+4y+%2B+12+%E2%89%A6+0%2Cx2%2By2%E3%81%AE%E6%9C%80%E5%A4%A7%E5%80%A4&lang=ja (4) x2 + y2 − 6x − 4y + 12 ≦ 0,y/xの最小値 https://www.wolframalpha.com/input?i=+x2+%2B+y2+%E2%88%92+6x+%E2%88%92+4y+%2B+12+%E2%89%A6+0%2Cy%2Fx%E3%81%AE%E6%9C%80%E5%B0%8F%E5%80%A4&lang=ja
(1)
https://www.wolframalpha.com/input?i=+x2+%2B+y2+%E2%88%92+6x+%E2%88%92+4y+%2B+12+%E2%89%A6+0&lang=ja
(2)
x2 + y2 − 6x − 4y + 12 ≦ 0,2x+1の最大値9
(3)
x2 + y2 − 6x − 4y + 12 ≦ 0,x2+y2の最大値
https://www.wolframalpha.com/input?i=+x2+%2B+y2+%E2%88%92+6x+%E2%88%92+4y+%2B+12+%E2%89%A6+0%2Cx2%2By2%E3%81%AE%E6%9C%80%E5%A4%A7%E5%80%A4&lang=ja
(4)
x2 + y2 − 6x − 4y + 12 ≦ 0,y/xの最小値
https://www.wolframalpha.com/input?i=+x2+%2B+y2+%E2%88%92+6x+%E2%88%92+4y+%2B+12+%E2%89%A6+0%2Cy%2Fx%E3%81%AE%E6%9C%80%E5%B0%8F%E5%80%A4&lang=ja