8¹⁰-8⁹+8⁸ = 8⁸(8²-8¹+1) = 8⁸×57 — кратно 57;
15⁴-10⁴-5⁴ = (15²)²-(10²)²-(5²)² = 225²-100²-25² = (225-25)(225+25)-100² = 200×250-100² = 50000-10000 = 40000 – кратно 80.
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8¹⁰-8⁹+8⁸ = 8⁸(8²-8¹+1) = 8⁸×57 — кратно 57;
15⁴-10⁴-5⁴ = (15²)²-(10²)²-(5²)² = 225²-100²-25² = (225-25)(225+25)-100² = 200×250-100² = 50000-10000 = 40000 – кратно 80.