有關5a14b的精選大全

已知關於x的方程(5a+14b)x+6=0無解,則ab是(  )A.正數                   ...
問題詳情:已知關於x的方程(5a+14b)x+6=0無解,則ab是()A.正數                     B.非負數                  C.負數                     D.非正數【回答】D【分...
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