有關z4x6y3的精選大全

.已知實數x,y滿足則z=4x+6y+3的取值範圍為(  )A.[17,48]                ...
問題詳情:.已知實數x,y滿足則z=4x+6y+3的取值範圍為()A.[17,48]                 B.[17,49]           C.[19,48]           D.[19,49]【回答】B解析由z=4x+6y+3得y=-x+,作出...
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