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2. Формула разности квадратов

х2−у2=(х−у)(х+у)

7n2−7m2=7(n2−m2)=7(n−m)(n+m)

50ap2−32am2=2a · (25p2−16m2)=2a((5p)2−(4m)2)=2a(5p−4m)(5p+4m)
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