1 if a=b, then a? =b？ Inverse proposition: if a? =b？ Then a=b, this inverse proposition is wrong. Counterexample: (-2)? =(2)? , but -2≠2

Inverse proposition that the complementary angles of equal angles are equal: if the complementary angles of two angles are equal, the two angles themselves are equal. This inverse proposition holds.

3 if |a|=|b|, then a=b inverse proposition: if a=b, then |a|=|b| this is a true proposition.