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（数学选修2-2）第二章推理与证明一、选择题1．数列2,5,11,20,,47,x…中的x等于（）A．28B．32C．33D．272．设,,(,0),abc则111,,abcb... 2025-03-29424123.5 KB5页211
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第二章推理与证明[基础训练A组]一、选择题1．数列2,5,11,20,,47,x…中的x等于（）A．28B．32C．33D．272．设,,(,0),abc则111,,abcbca... 2025-03-291915365 KB13页153
