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Which textbook should I choose for the third grade Olympic Mathematics in primary school?
Shaanxi People's Education Publishing House's "Draw inferences from others" is very good. It is best to use version A and version B together. Version A is an explanation and version B is an exercise. Of course, version A also has several problems. If you think the problems are not enough, buy version B. ..

Guangzhou Publishing House also has "Inference", which is quite difficult. Each chapter has 5 sections, each section has an explanation and three exercises.