2022平谷区初三二模数学试卷答案

平平谷区谷区2022年年二二模试卷评分标准模试卷评分标准初初三三数数学学2022年5月一、选择题（本题共16分，每小题2分）二、填空题（本题共16分，每小题2分）题号910111213141516答案1x)1)(1(xxx1x答案不唯一例：（4，-2）（2，-4）（1,1）64940°12;126三、解答题(本题共68分，第17-22题，每小题5分，第23-26题，每小题6分，第27-28题，每小题7分)解答应写出文字说明、演算步骤或证明过程.17.解：-1o318-2cos301333=23-2313····················································································4=4··············································································································518.解不等式组：53462xxxx解①得3x·································································································2解②得2x··································································································432x····································································································519.先化简，再求值：)1(2)2(2mm24422mmm···················································································2226mm························································