Start by finding a common denominator. If the radical includes the entire fraction (3/4 for the first part), the common denominator would be square root of 12.
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(1 over radical three) over three - I assume that's how you are describing it - can be simplified like any division problem involving fractions in the numerator and denominator. To solve the problem, you take the fraction in the denominator (in this case 3 over 1) and invert it (making it 1 over 3) and multiply it by the numerator. You would have (1 over radical 3) times (1 over 3) which would give you 1 over (3 times radical 3)
2b
12x^2√5x
2a+5
sqrt(27) = 3*sqrt(3).