сократить дробь а^2-b^2/(a+b)^2
а^2-b^2/(a+b)^2=(a+b)(a-b)/(a+b)^2=a-b/a+b
(а-b)*(a+b)/(a+b)^2=a-b/a+b
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а^2-b^2/(a+b)^2=(a+b)(a-b)/(a+b)^2=a-b/a+b
(а-b)*(a+b)/(a+b)^2=a-b/a+b