有關2x3y2m的精選大全

若單項式2x3y2m與﹣3xny2的差仍是單項式,則m+n的值是(  )A.2                ...
問題詳情:若單項式2x3y2m與﹣3xny2的差仍是單項式,則m+n的值是()A.2                          B.3                          C.4                  ...
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