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12 ÷ 4/9 = 27
4 + 9 - 12 = 1
For the values: 12, 9, 4 the LCM is: 36
Here are some out of a large number of ways:4 + 8 + 12 + sqrt(9)12*8/4 + sqrt(9)8*12/4 + sqrt(9)
(4/9) / (7/12) = (4/9) * (12/7) = (4*12)/(9/7) = 48/63 = 16/21