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已知实数x,y,z满足x+y+2z=1,,则z的取值范围是( ) A. B. C...
已知实数x,y,z满足x+y+2z=1,
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,则z的取值范围是( )
A.
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B.
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C.0≤z≤2
D.0<z≤1
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