1 , 5 , 19 , 49 , 109 , ( )A.170 B.180 C.190 D.200

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问题 1 , 5 , 19 , 49 , 109 , ( )

选项 A.170 B.180  C.190 D.200

答案C

解析解析:19-5+1=15 ① ②-①=21 49-19+(5+1)=36 ② ③-②=49 109-49+(19+5+1)=85 ③ ④-③=70 (70=21+49) ?-109+(49+19+5+1)=④ ④=155 ?=155+109-(49+19+5+1)=190
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