高中数学代数与函数一其他练习题110
题目内容

http://picflow.koolearn.com/upload/papers/20140824/20140824040138535423.png=(1, http://picflow.koolearn.com/upload/papers/20140824/20140824040138551298.png), http://picflow.koolearn.com/upload/papers/20140824/20140824040138566390.png=(0,1),O为坐标原点,动点P(x,y)满足0≤ http://picflow.koolearn.com/upload/papers/20140824/20140824040138582366.png· http://picflow.koolearn.com/upload/papers/20140824/20140824040138535423.png≤1,0≤ http://picflow.koolearn.com/upload/papers/20140824/20140824040138582366.png· http://picflow.koolearn.com/upload/papers/20140824/20140824040138566390.png≤1,则z=y-x的最大值是(  )

2021-07-19

A.http://picflow.koolearn.com/upload/papers/20140824/20140824040138644306.png

B.1

C.-1

D.-2

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