(a+b)(a-2b)-a(a-b)化简

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(a+b)(a-2b)-a(a-b)化简
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(a+b)(a-2b)-a(a-b)化简
(a+b)(a-2b)-a(a-b)化简

(a+b)(a-2b)-a(a-b)化简
(a+b)(a-2b)-a(a-b)
=a²-ab-2b²-a²+ab
=-2b²
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原式=a^2-ab-2b^2-a^2+ab
=-2b^2