a³ + b³ = (a + b)(a² - ab + b²)(a - b)² = a² - 2ab + b²------(78³ + 64)³/142 - 78*64 = (78 + 64)*(78² - 78*64 + 64²) / 142 - 78*64 = 142*(78² - 78*64 + 64²) / 142 - 78*64 = 78² - 78*64 + 64² - 78*64 = 78² - 2*78*64 + 64² = (78 - 64)² = 14² = 196
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a³ + b³ = (a + b)(a² - ab + b²)
(a - b)² = a² - 2ab + b²
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(78³ + 64)³/142 - 78*64 = (78 + 64)*(78² - 78*64 + 64²) / 142 - 78*64 = 142*(78² - 78*64 + 64²) / 142 - 78*64 = 78² - 78*64 + 64² - 78*64 = 78² - 2*78*64 + 64² = (78 - 64)² = 14² = 196
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