初中数学人教版八年级上册整式的乘除(习题及答案)

3. ①x2?9y2

②a2?4b2?a?2b ③?4m2?2mn?12n2 ④x2?4xy?4y2

⑤a2?b2?c2?2ac 4. D 5. C 6. ①3x2z2

②

12 ③8x4y

④?4x3y

⑤2mn2 7. ①?x2z?2x

3②?b2?4ab?6a2

③?n2?2m2

④?m3n2?3m2n?12m2 8. ①2a3c2

②7

③a2?3ab

? 思考小结

(a?b)(p?q)?ap?aq?bp?bq

(a?b)(a?2b)?a2?3ab?2b2

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