平谷区2022届初三一模数学试题及答案（官方版）

平平谷区谷区2022年一模试卷评分标准年一模试卷评分标准初初三三数数学学2022年4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x2)1x(+a1−=x答案不唯一例：233−1k<1;50三、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：-1o112-3tan3025+−−3=235-323+−······················································································4=33+······································································································518.解不等式组：22532xxxx++解①得2x·································································································2解②得1x−································································································412x−···································································································519.先化简，再求值：)1(2)1)(1(−++−aaa2122aa=−+−···························································································2223aa=+−·········································································