数列难题 四:强化练习:1.若等差数列中(1)若a4=6,a7=9,a11=多少?(2)若a1+a2+a3=5,a3+a4+a5=10,a7+a8+a9=多少?(3) 若a6=8,S11=多少?2.在等差数列{an}中,S11=22则a6=多少?3.已知等差数列满足a1+a2+a3+……+a101=0则
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![数列难题 四:强化练习:1.若等差数列中(1)若a4=6,a7=9,a11=多少?(2)若a1+a2+a3=5,a3+a4+a5=10,a7+a8+a9=多少?(3) 若a6=8,S11=多少?2.在等差数列{an}中,S11=22则a6=多少?3.已知等差数列满足a1+a2+a3+……+a101=0则](/uploads/image/z/1999779-51-9.jpg?t=%E6%95%B0%E5%88%97%E9%9A%BE%E9%A2%98+%E5%9B%9B%EF%BC%9A%E5%BC%BA%E5%8C%96%E7%BB%83%E4%B9%A0%EF%BC%9A1.%E8%8B%A5%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%E4%B8%AD%281%29%E8%8B%A5a4%3D6%2Ca7%3D9%2Ca11%3D%E5%A4%9A%E5%B0%91%3F%EF%BC%882%EF%BC%89%E8%8B%A5a1%2Ba2%2Ba3%3D5%2Ca3%2Ba4%2Ba5%3D10%2Ca7%2Ba8%2Ba9%3D%E5%A4%9A%E5%B0%91%3F%283%29+%E8%8B%A5a6%3D8%2CS11%3D%E5%A4%9A%E5%B0%91%3F2.%E5%9C%A8%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%7Ban%7D%E4%B8%AD%2CS11%3D22%E5%88%99a6%3D%E5%A4%9A%E5%B0%91%3F3.%E5%B7%B2%E7%9F%A5%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%E6%BB%A1%E8%B6%B3a1%2Ba2%2Ba3%2B%E2%80%A6%E2%80%A6%2Ba101%3D0%E5%88%99)
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