The general form of hypothetical proposition is: if P, then Q, where P is the antecedent (sufficient condition) and Q is the consequence (necessary condition). According to the requirements of the topic, we need to find a hypothetical proposition to satisfy that when "both small A and small B have to take exams" is true, this hypothetical proposition is false.
Now let's analyze the known answer to the question: "If small A takes the exam, then small B doesn't take the exam". In this hypothetical proposition, P means "small A test" and Q means "small B does not test". According to the topic conditions, "both small A and small B should be tested" is true, then "small A should be tested" is true and "small B should not be tested" is false. Since the antecedent in the hypothetical proposition is true and the latter is false, then according to the truth table of the hypothetical proposition, the hypothetical proposition is false at this time.
So, we got the answer to the question: "If small A takes the exam, then small B doesn't take the exam".
The reasoning process is as follows:
1. According to the law of contradiction, a proposition and its negation cannot be true at the same time.
2. The condition of the topic is that "both small A and small B should be tested" is true.
3. Find a hypothetical proposition. When "Small A and Small B have to take exams" is true, this hypothetical proposition is false.
4. Analyze the known answer: "If the small A test, then the small B does not test".
5. When "both small A and small B are tested" is true, "small A is tested" is true and "small B is not tested" is false.
6. Since the antecedent of the hypothetical proposition is true and the latter is false, the hypothetical proposition is false at this time.
Therefore, the answer is: "Small A test, that small B does not test".