1.7X²-63;2.a³-a;3.3a²-3b²;4.y²-9(x+y)²;5.a(x+y)-b(y-x)+c(x-y);6.x(m+n)-y(n+m)+(m+n);7.(x+y)²-16(x-y)²;8.a²(a-b)²-b²(a+b)²;9.(x+y

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