When "solution" is not written in the process of solving the equation, 0.5 point is usually deducted appropriately. Therefore, the details determine the fate, no matter when, we must develop a rigorous learning attitude. In particular, things with common sense should be perfected as far as possible, and the word "solution" in solving equations is essential.

Write the solution to the problem and the proof to prove the problem. Common expressions such as "because", "from this" and "theorem" are necessary. But under normal circumstances, the senior high school entrance examination will write down the solutions and answers in the answer area of the answer sheet in advance. In this case, there is no need to write down the solution.