随机产生10道互不相同的20以内的加减法（加减数及和差均<=20）待用户答完题后，显示用户的得分、评语及正确答案。并带彩色，计时器和系统日期和时间。这是我的汇编课程设计！-randomly generated 10 incompatible with the 20 within the addition and subtraction (plus or minus a few and the poor and have lt; = 20) to be wound that users, s