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(2)通过an=2n,可知bn=2n•3n,利用错位相减法可求出1•31+2•32+…+n•3n的值,进而可得结论. 解答解:(1)设等差数列的公差为d, 则a1+a2+a3=a1+(a1+d)+(a1+2d)=3a1+3d=12, 又∵a1=2,∴d=2, ∴数列{an}的通项公式an=a1+(n-1)d=2n; ...
PROBLEM TO BE SOLVED: To enhance thermal conductivity by bonding a semiconductor chip and a heat sink through composite solder containing lead tin solder and one thermal conductivity filling material.シプリアンイーウゾーダニエルシィエデルステイン...
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动词正确形式When the CD-ROM was put in the CD-player,an icon___(appear)on the screen 扫码下载作业帮搜索答疑一搜即得 答案解析 查看更多优质解析 解答一 举报 appearedappear没有被动语态 解析看不懂?免费查看同类题视频解析查看解答 更多答案(2) 相似...