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一、万以内加法的教学是承上启下的重要阶段。 20以内的加法,是加法计算的基础。100以内的加法,是笔算加法的开始,通过它们的学习,学生基
I. Teaching of Additions Within Ten Thousands is an Important Phase of Enlightenment. Additions within 20 are the basis for addition. Additions within 100 are the beginning of the pen-sum addition, through their learning, student base