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= x/a(x²-b²)/x² + x/b(x² - a²)/x²
= (x² - b²)/ax + (x² - a²)/bx
maka nilai dari :
f(a+b) = ((a+b)² - b²)/(a(a+b)) + ((a+b)² - a²)/(b(a+b))
= (a+b+b)(a+b-b)/(a(a+b)) + (a+b+a)(a+b-a)/(b(a+b))
= a(a+2b)/(a(a+b)) + b(2a+b)/(b(a+b))
= (a+2b)/(a+b) + (2a+b)/(a+b)
= (a+2b+2a+b)/(a+b)
= (3a + 3b)/(a + b)
= 3(a+b)/(a+b)
= 3