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(a+b)² = a²+2ab+b²
Maka,
(a+b)³ = (a+b)²(a+b)
(a+b)³ = (a²+2ab+b²)(a+b)
(a+b)³ = a³+2a²b+ab²+a²b+2ab²+b³
(a+b)³ = a³+3a²b+3ab²+b³
1 1 1 2 1kuadrat 1 3 3 1pangkat 3
1 4 6 4 1pangkat 4 dst
hasil= 1 a^3 +3 a^2 b +3 a b^2 +1 b^3
maka = 1