1.4,12,30,68( )A144 B146 C148 D1562.-2,1,-8/27,1/16,( )A-32/3125 B32/3125C-64/3125D-129/3125

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1.4,12,30,68(  )A144 B146 C148 D1562.-2,1,-8/27,1/16,(  )A-32/3125 B32/3125C-64/3125D-129/3125
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1.4,12,30,68( )A144 B146 C148 D1562.-2,1,-8/27,1/16,( )A-32/3125 B32/3125C-64/3125D-129/3125
1.4,12,30,68( )A144 B146 C148 D1562.-2,1,-8/27,1/16,( )A-32/3125 B32/3125C-64/3125D-129/3125

1.4,12,30,68( )A144 B146 C148 D1562.-2,1,-8/27,1/16,( )A-32/3125 B32/3125C-64/3125D-129/3125
1、选择B12-4=830-12=1868-30=38146-68=788、18、38、78组成一个新的数列,后一项是前一项的两倍加2.如18=8*2+2.2、选择A原式可变形为(-2)^1/1^1,(-2)^2/2^2,(-2)^3/3^3,(-2)^4/4^4,依规律下一项是(-2)^5/5^5,即-32/3125.所以选择A.
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