已知有序数组（a,b,c,d），现按下列方式重新写成数组（a1,b1,c1,d1）使a1=a+b,b1=a+c

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假设A+B+C+D=M
则A1+B1+C1+D1=A+B+A+C+C+D+D+A=2M
同理，An+Bn+Cn+Dn=2^n*M
由1000<（An+Bn+Cn+Dn）÷（A+B+C+D）<2000
得1000<2^n<2000
n=10

祝你学习愉快！追问

为什么A+B+A+C+C+D+D+A=2M?A+B+A+C+C+D+D+A=3A+B+2C+4D≠2A+2B+2C+2D

追答

是你写错了吧，B1=B+C吧

追问

没写错，书上就是这样

追答

如果真是这样，那这个题就不能解了，我敢肯定这是书上打印错误！