According to the question: △=(a+b)? -4(3+ab/2)=a？ +b？ -12≥0, that is, a? +b？ ≥ 12。

Remember a = {(a, b) i? Answer? +b？ ≥ 12},

The combined number of values of a and b is C (1, 4) C (1, 4) = 16.

Substituting the values of a and b into the conditions, we can see that there are 8 combinations that meet the requirements.

P(A)=8/ 16=0.5

According to the characteristics of the topic, it is surrounded by a square with an area of 72, and A stands for a circle with an area of 12π.

So what satisfies the condition is the area of the part where the square is cut by the circle.

So p (a) = (72-12π)/72 = (6-π)/6.