[(a-2b)²-(a+3b)(a-2b)]/(-5b)化简.
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[(a-2b)²-(a+3b)(a-2b)]/(-5b)化简.
[(a-2b)²-(a+3b)(a-2b)]/(-5b)化简.
[(a-2b)²-(a+3b)(a-2b)]/(-5b)化简.
原式=[(a-2b)(a-2b-a-3b)]/(-5b)=(a-2b)(-5b)/(-5b)=a-2b