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数学5（必修）第二章：数列(A卷)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}{,7,3,}{51第... 2025-03-291301128.5 KB6页139
