分数类，可以实现分数的加减乘除，及分数与整数的混合运算-Score category, you can realize addition and subtraction, multiplication and division scores, and scores with a mixture of integer calculations

一个用到ZLG7289的实际项目，对按键和显示较多的程序有较*价值-A ZLG7289 use the actual items, buttons and display more of the procedures have a larger reference value