题目内容
【题目】(1)计算(12a3﹣6a2+3a)÷3a;
(2)计算(x﹣y)(x2+xy+y2).
【答案】(1)4a2﹣2a+1;(2)x3﹣y3.
【解析】
(1)根据多项式除以单项式即可得出答案;
(2)根据多项式乘以多项式展开,再合并同类项即可得出答案.
解:(1)(12a3﹣6a2+3a)÷3a
=12a3÷3a﹣6a2÷3a+3a÷3a
=4a2﹣2a+1
(2)(x﹣y)(x2+xy+y2)
=x3+x2y+xy2﹣x2y﹣xy2﹣y3
=x3﹣y3.
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