[(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)]/

[(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