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When to use addition and subtraction in the wide-angle concentration of mathematics in the first volume of the third grade
Grade three, the first volume of mathematics, wide-angle set, addition and summation, subtraction and difference. Mathematics wide-angle set is the first volume of primary school mathematics published by People's Education Publishing House, which contains addition and subtraction, when to use summation in addition and when to use subtraction in difference. Mathematics wide-angle set guides students to learn to infiltrate the idea of simple set through observation, thinking and communication.