ab÷c = 1 ,bc÷a=2,ca÷b=3 tentukan nilai a²+b²+c² =.......

a² + b² + c² = (ab/c)(ca/b) + (bc/a)(ab/c) + (bc/a)(ca/b)
                   = (1)(3) + (2)(1) + (2)(3)
                   =  3 + 2 + 6
                   = 11