青海省西宁市城区2021年中考真题数学试卷(原卷版)
青海省西宁市城区2021年中考真题数学试卷一、选择题(本大题共8小题,每小题3分,共24分.)1.的相反数是( )A.B.-C.D.2.某几何体的三视图如图所示,则此几何体是()A.圆锥B.圆柱C.长方体D.四棱柱3.中国人最先使用负数,魏晋时期的数学家刘徽在其著作《九章算术注》中,用不同颜色的算筹(小棍形状的记数工具)分别表示正数和负数(红色为正,黑色为负).如图1表示的是(+2)+(-2),根据这种表示法,可推算出图2所表示的算式是()A.B.C.D.4.下列图形中,既是轴对称图形又是中心对称图形的是()A.三角形B.等边三角形C.平行四边形D.菱形5.下列命题是真命题的是A.同位角相等...
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