问题
填空题
3ax2•（______）=3a2x3-6ax2+9a3x4．
答案
（3a2x3-6ax2+9a3x4）÷3ax2
=3a2x3÷3ax2-6ax2÷3ax2+9a3x4÷3ax2
=ax-2+3a2x2．
故答案为：ax-2+3a2x2．
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3ax2•（______）=3a2x3-6ax2+9a3x4．
（3a2x3-6ax2+9a3x4）÷3ax2
=3a2x3÷3ax2-6ax2÷3ax2+9a3x4÷3ax2
=ax-2+3a2x2．
故答案为：ax-2+3a2x2．