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1=0的絕對值+1 -3=-(1的絕對值+2) 7=(-3)的絕對值+4 -15=-(7的絕對值+8) 31=(-15)的絕對值+16 ., 所以 第100個數 =0+1+2+4+8+16+...+2的98次方 =1+2+4+8+16+...+2的98次方 =(1-2的99次方)/(1-2) =2的99次方-1
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