1、7,5,3,10,1,(),()A.15,-4 B.20,-2 C.15,-1 D.20,02、123,112,90,()A.87 B.57 C.25 D.693、129,107,73,17,-73,()A.-55 B.89 C.-219 D.-81
參考答案:1、7,5,3,10,1,(20),(0)
A.15,-4 B.20,-2 C.15,-1 D.20,0
2、123,112,90,(57)
A.87 B.57 C.25 D.69
3、129,107,73,17,-73,(-219)
A.-55 B.89 C.-219 D.-81