17．已知等式ax = ay.下列变形正确的是( ) A．x = y B．ax +1 = ay +1 C．ay = ax D．3ax = 3ay——青夏教育精英家教网—

摘要：17．已知等式ax = ay.下列变形正确的是( ) A．x = y B．ax +1 = ay +1 C．ay = ax D．3ax = 3ay

网址：http://m.1010jiajiao.com/timu3_id_651882[举报]

已知等式ax＋5＝ay＋5，则下列式子变形不一定正确的是