小学生教学辅助系统 加减乘除运算 有大约6个功能-Primary school teaching auxiliary systems, Math operations about six functional

小学生数学题，能根据给出范围自动列出加减乘除的计算题目，同时也有答案，对照-Primary school math problems, can automatically listed under the given range of computing topics of addition, subtraction, as well as answer control