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is, what, shirt, the, colour (?) _______________
7个月前
Experts believe_______people can waste less food by shopping only when it is necessary.
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1年前
已知{an}是等比数列,a1=3,a4=24,数列{bn}满足:b1=0,bn+b(n+1)=an, (1)求证an=3×2^n-1; (2)求证:bn=2^(n-1)+(-1)^n.
1年前
Which letter(字母) has the different(不同的)vowel(元音)? A . Ff B . Kk C . Jj D . Hh
1年前