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《伟大的悲剧》一文中那位英雄队长的名字叫__________。
1年前
A human ______ can do some things better than a computer, for example, creating new ideas.
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I carried the bowl with both hands________, so that I wouldn’t break it. [ ]
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One of the best-loved American writers was William Sydney Porter, or O. Henry.
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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