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(数学5必修)第二章：数列[基础训练A组]一、选择题1．在数列55,34,21,,8,5,3,2,1,1x中，x等于（）A．11B．12C．13D．142．等差数列9}{,27,39... 2025-03-281964336.5 KB12页219
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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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