【正文】
是( ?。?,n表示的數(shù)是( )。 ?。?、含有未知數(shù)的式子是方程。( ?。 。?、當(dāng)x=2時(shí),x2=2x。( ?。 。?、mcnc=(mn)c。( ?。河⒄Z 一. 根據(jù)文字完成句子 1. My daughter often plays the ______ after school every day. (鋼琴) 2. This _____ is from Australian, and I like it very much. (袋鼠) 3. Lucy likes collecting ’s her brother’s hobby? (樹葉) 4. Can your brother ______, Mike?Yes, he can. (游泳) 5. John’s uncle is a