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已知数列{an}满足a1=1,a2=2对于任意的正整数n都有an•an+1≠1,...
已知数列{an}满足a1=1,a2=2对于任意的正整数n都有an•an+1≠1,anan+1an+2=an+an+1+an+2,则S100= .
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