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已知x,y满足,则z=2x-y的最大值为A.2B.1C.-1D.3
试题详情
已知x,y满足
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADkAAAA/CAYAAABaQWCYAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAM2SURBVGhD7Zq9cewgEIDVxSvDgXN1csl1oCo8
TlSAGnDq5GI14eQipdcFjwWBAPGz/EiyGb4ZzfhsGe23LPjYc0c8jLcbea5f/2Wskq+fB+m6jozf
NShaJGsTBAzJF7m//SPvt3F9/YdYJtJ3PZmW9bWCJnn+LC5k6jsyzOvLVOaBxd1hJJ/fI7v58fNa
v3MO8wAB0qufqHYqMxmyJUW2ZCAwKC4wqwSMZ/4uKzm41x6snxKSDCgvGAgGHOiwHClhu0QtWtbM
PLkSxMsYkvCFGZtRTBJi7ek9myAeM4iZTJaI+Pj2YP0UlGQzgijRPRDEtsksdBa3RK0zR3/ex9ut
FJScaaZdW7UfZSeliRrYAEIuZTyTQpJQShAkrEEWLN08tGXhhQv1dAaHpEoIUUBSKyWx0+INGXyD
SlnPAeSuzC8zrPg1mcF+N93WovUqNOPHSspNSlmPF3CsZODt1lmcWq5X0SRroUnWQpOshSZZC03y
V2Fpn2DRJB+fdyaZ1ZBMOGMG7898D6xJjrd3NlgWUZIcXEvSfSgOIY1EY9lZqiKbMhDes9kFZpEs
05LMlnyyIMKdcygveBA8ENmSFPdZ1hSmJbn9PENSzCB2HQZbks5yNYOMbUlmzqTYVVGi8rTvwCu5
bTLxLclMSQArGmxJOiWVnZQmKr4lWUAS87EdqiUZkExvSRaR9P+d1EqJisDr01qSctflV+Rjdcmj
3/G0luSBHCspyjpxLZXi1HK9iiZZC02yFppkLTTJWmiSO9TTwFVvRE0QMUVI0vOcPBXop/zTgffE
LBZcTHjJBc4SG/LgfCKyYSYejIwpbU1CJtXRxGnDyCrmPCgDV++VM0VRytGbVDMmhWjJXTYlcGaE
IxUIItuVYgwmoh/H5umDfMCBOiZRpSQZa3bNzlqwXekEEqNKKu1Kx7N2eO5Lk6QwITPL8CBE5vfo
m4beruTwBMKMuZNojYmSLGlbA2X/g9KFZ7071mWi5L5ng2pXOuHj5f0HpbuPhJeELLFy4ZcYTCz6
S9qVjphMNEnxucj987F+5zyObFdqkkCRD2IxyE3KXWal2EkCp4jKUju+XWmVBGI/0vu9EPIfEAfi
TI3G1uAAAAAASUVORK5CYII=
)
,则z=2x-y的最大值为( )
A.2
B.1
C.-1
D.3
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A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAjCAYAAACpZEt+AAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAKVJREFU
OE/dU9ENhTAIxJVZh02YgylYAqGNlVptNO/FD0mapskB1+NYzANmEYBZwH2AsiGgsfYptYJQ8PBz
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