1:11 × (2 ÷ 11 + 2)
2:11 × ((2 ÷ 11) + 2)
3:11 × (2 + 2 ÷ 11)
4:11 × (2 + (2 ÷ 11))
5:(2 ÷ 11 + 2) × 11
6:((2 ÷ 11) + 2) × 11
7:(2 + 2 ÷ 11) × 11
8:(2 + (2 ÷ 11)) × 11
可能有重复
只考虑位置,没考虑重复了呵呵
将就下吧