Question

已知集合A ={1,2,3}，B={1,2}， 设集合C ={x|x=a-b，a∈A，b∈B}， 试用列举法表示集合C

已知集合A ={1,2,3}，B={1,2}， 设集合C ={x|x=a-b，a∈A，b∈B}， 试用列举法表示集合C
12级的那个，稍微给点过程，我就加分选你了

Answer 1

c={-1,0,1,2}
当1-1=0,1-2=-1,2-1=1,2-2=0，3-1=2，3-2=1

Answer 2

C={0，-1,1，2,}

Answer 3

x=a-b;
when a = 1, b = 1; x=a-b = 0;
when a = 1, b = 2; x=a-b = -1;
when a = 2, b = 1; x=a-b = 1;
when a = 2, b = 2; x=a-b = 0;
when a = 3, b = 1; x=a-b = 2；
when a = 3, b = 2; x=a-b = 1;

so C ={-1,0,1,2}
不知对不？

Answer 4

学习了
这个是什么东西啊？