What can I say? Deductive reasoning is the most important and widely used thinking method in mathematical proof. Mathematical axiom, formula application and proof are all deductive reasoning, because deductive reasoning is based on known facts or formulas. If the premise is correct, that is, the formula is correct, then the conclusion must be correct. This is mathematical proof thinking. So doing proof questions is helpful for students to cultivate deductive reasoning ability. But the current education is generally not like this, but depends on the cultivation of mathematical ability, so that students have deductive logical thinking mode, which can be said to be closely related and complementary.