Ответ:
Объяснение:
(x-y)(x+y)-(a-x+y)(a-x+y)-a(2x-a)=0
x²-y²-(a-x)²+y²-2ax+a²=0
x²-y²-a²+2ax-x²+y²-2ax+a²=0
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Ответ:
Объяснение:
(x-y)(x+y)-(a-x+y)(a-x+y)-a(2x-a)=0
x²-y²-(a-x)²+y²-2ax+a²=0
x²-y²-a²+2ax-x²+y²-2ax+a²=0