问题标题:
化简(3a-2a+1)²-(a-2b)(a+3b)
问题描述:

化简(3a-2a+1)²-(a-2b)(a+3b)

李金宗回答:
  (3a-2a+1)²-(a-2b)(a+3b)   =(a+1)²-(a-2b)(a+3b)   =a^2+2a+1-(a^2+ab-6b^2)   =a^2+2a+1-a^2-ab+6b^2   =2a+1-ab+6b^2   =6b^2-ab+2a+1   =6b^2-a(b-2)+1
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