1,3,7,15,31,(),127,255括号里填多少
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1,3,7,15,31,(),127,255括号里填多少
1,3,7,15,31,(),127,255括号里填多少
1,3,7,15,31,(),127,255括号里填多少
1,3,7,15,31,(63),127,255
3=1+2
7=3+4
15=7+8
31=15+16
(63)=31+32
127=63+64
255=127+128
31乘2加1
63
63!!!
括号里应该是63