5-2=3
9-5=4
14-9=5
20-14=6
X-20=7
正負(fù)號(hào)交叉得
X=-27
2,-5,9,-14,20,X,5求X
2,-5,9,-14,20,X,5求X
其他人氣:126 ℃時(shí)間:2020-10-02 03:28:18
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