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→ a²-b² = 104 x 96
a²-b² = (100+4)(100-4)
100²-4² = (100+4)(100-4)
10.000-16 = 104 x 96
9984 = 9984
b. → a²-b² = (a+b)(a-b)
→ a²-b² = 203 x 197
a²-b² = (200+3)(200-3)
200²-3² = (200+3)(200-3)
40.000-9 = 203 x 197
39991 = 39991