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= (1/2 + 1/3) / (1/4 + 1/9)
= (3/6 + 2/6) / (9/36 + 4/36)
= (5/6) / (13/36)
= (30/36) / (13/36)
= 30/13
a^-2 + b^-2 1/a² + 1/b²
= (a+b)/ab
(a²+b²)/ab
= a + b
a² + b² Untuk a = 2 dan b = 3 maka nilainya
= 2 + 3
2² + 3²
= 5/13