(a+b)(a-2b)+(2b-a)(2b+a)
упростите выражение
(а+b)(a-2b)+(2b-a)(2b+a)=a^2 - 2ab+ab-2b^2+4b^2-a^2=2b^2-ab
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(а+b)(a-2b)+(2b-a)(2b+a)=a^2 - 2ab+ab-2b^2+4b^2-a^2=2b^2-ab