4.2,5.2,8.4,17.8,44.22,( )A.125.62 B.85.26 C.99.44 D.125.64

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问题 4.2,5.2,8.4,17.8,44.22,( )

选项 A.125.62
B.85.26
C.99.44
D.125.64

答案A

解析整数部分作差1 3 9 27 81,44+81=125 小数部分4=2×2 5=2×2+1 8=4×2 17=8×2+1 44=22×2,125=62×2 +1,答案为125.62
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