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-b[(a-2b)^2+2b(a-2b)-(a+2b)(a-2b)]/(-2b)^2
2025-04-03 18:01:40
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回答1:

-b[(a-2b)^2+2b(a-2b)-(a+2b)(a-2b)]/(-2b)^2
=-b(a-2b)[(a-2b)+2b-(a+2b)]/4b^2
=-(a-2b)(-2b)/4b
=(a-2b)/2