((а²-в²)/ав)):(1/в-1/а)=((а²-в²)/ав)):((а-в)/ав)=(а+в)(а-в)*ав/ав(а-в)=а+в
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((а²-в²)/ав)):(1/в-1/а)=((а²-в²)/ав)):((а-в)/ав)=(а+в)(а-в)*ав/ав(а-в)=а+в