разложите на множители:ах (в квадрате)-ау(в квадрате)
a(x^2-y^2)....................
ax²-ay²
a(x²-y²)=a(x-y)(x+y)
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a(x^2-y^2)....................
ax²-ay²
a(x²-y²)=a(x-y)(x+y)