Who are you? Are you Tutu? [ ]
A. Yes, I do.
B. No, I am Zip!
C. Yes, please.
答案:B
数学老师在计算六年级(1)班的数学成绩,平均成绩为70.25分,复查时发现,扎西的68分误记作86分,再次计算时,平均成绩为69.85分,这个班共有学生多少人.
写出系数是-3,次数是5次,字母因数为a,b的三个代数式 .