I have had this problem before, and the most hateful thing is to directly substitute the formula into twice the calculation. As a result, all the results are twice the answers, which is simply tragic.

The calculation error is 1 to a great extent.

Carelessness, 2.

Too fast when doing problems;

For this one, my approach is 1.

Circle the important information directly (the same is true in the exam, with a pencil) and know that you have this problem. The first thing to do is to circle (numbers, symbols, conditions) and circle all the necessary information. Then skim through the questions when you do them, and you can solve the wrong things.

2.

If the calculation is wrong, it can only be calculated at 1.

Look back every time you count one (usually you can practice it dozens of times, and then you can't help it ...) 2.

After the calculation, substitute the results into the review, substitute them quickly, and look at the problem-solving process!

Meeting someone wrong is the most painful thing, and so is working in the future! The finer the better!

Good luck! !