2023年八年级数学参考答案及评分标准009.pdf

2023年春季八年级期末教学质量监测

数学参考答案及评分标准

说明：

（一）考生的正确解法与“参考答案”不同时，可参照“参考答案及评分标准”的精神

进行评分．

（二）如解答的某一步出现错误，这一错误没有改变后续部分的考查目的，可酌情给分，

但原则上不超过后面应得的分数的二分之一；如属严重的概念性错误，就不给分．

（三）以下解答各行右端所注分数表示正确做完该步应得的累计分数．

一、选择题（每小题4分，共40分）

题号12345678910

答案BCDABDCBCA

二、填空题（每小题4分，共24分）

11．3；12．135°；13．15；14．9；15．2；16．②③④.

3

三、解答题（共86分）

17．(本小题满分8分)

解：原式＝153·················································································6分

＝－1························································································8分

18．(本小题满分8分)

解：原式＝x(x2)x21·································································4分



x2x3x2

1

＝·······················································································6分

2

x

1

当x5时，原式＝····························································7分

(5)2

1

＝·······································································8分

5

19．(本小题满分8分)

解：（1）把（－2，3）代入y＝kx＋7

－2k＋7＝3··················································································2分

解得，k＝2···················································································3分

∴一次函数的解析式为：y＝2x＋7····················································4分

（2）点P（－1，5）在该一次函数的图象上，理由如下：··························5分

当x＝－1时，y＝2×（－1）＋7＝5·············································7分

∴点P