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= 7√7 + 21√5 + 15√7 + 5√5
= 22√7 + 26√5
(a + b)³ = a³ + 3a²b + 3ab² + b³
(√7 + √5)³ = (√7)³ + 3(√7)²√5 + 3√7(√5)² + (√5)³
= 7√7 + 3.7√5 + 3.5√7 + 5√5
= 7√7 + 21√5 + 15√7 + 5√5
= 22√7 + 26√5
semoga membantu ya :)