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Is the model solution reliable? Is there a solution to the mathematical, physical and chemical model of junior high school?
Some of them are useful, but the method of summing up by yourself is the most effective.

For example, in chemical experiments, whether to turn off the lights or pull out the catheter first when making oxygen, why purify hydrogen and test the air tightness? Give you a substance to tell you the nature and let you infer; For example, calculation is also tricky.

C+O2=CO2

12 44

6 X then X=(44*6)/ 12 X=22.

These are all accumulated by yourself for a long time, and this is your problem-solving model.

In addition, there are typically summary examples in each part of the learning materials.