Mathematics
Senior High

数Ⅱです。解説お願いします🙇‍♀️🙏

(6)実数x,y が0≦x≦y≦1を満たして動くとき, z=y+2x2-4x は 18 20 22 (x,y)= のとき最小値 - 19 21 23 をとる.

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