设
=(1,
),
=(0,1),O为坐标原点,动点P(x,y)满足0≤
·≤1,0≤·≤1,则z=y-x的最大值是( )
A． |
B．1 | C．-1 | D．-2 |
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设=(1,),=(0,1),O为坐标原点,动点P(x,y)满足0≤·≤1,0≤·≤1,则z=y-x的最大值是( )
| A． |
B．1 | C．-1 | D．-2 |
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