2-1+4-3+6-5+8-7+10-9+1
17 查阅
2-1+4-3+6-5+8-7+10-9+12-11
参考答案:
2-1+4-3+6-5+8-7+10-9+12-11 =(2-1)+(4-3)+(6-5)+(8-7)+(10-9)+(12-11) =1+1+1+1+1+1 =6
2-1+4-3+6-5+8-7+10-9+12-11
参考答案:
2-1+4-3+6-5+8-7+10-9+12-11 =(2-1)+(4-3)+(6-5)+(8-7)+(10-9)+(12-11) =1+1+1+1+1+1 =6