广西壮族自治区钦州市浦北县第三中学2022-2023学年八年级下学期3月月考数学试题（图片版，含答案）

2023 年春季学期阶段性自主评估训练（一） 八年级 数学参考答案 一、选择题（本大题共 12小题，每小题 3分，共 36分．） 题号 1 2 3 4 5 6 7 8 9 10 11 12 答案 D C B C B D A C C A B D 二、填空题（本大题共 6小题，每小题 2分，共 12分．） c 13．x≥1 14．＞ 15． 16．6 17．1∶ 3∶2 18．2 26 2 三、解答题（本大题共 8小题，共 72分．） 19．（本题满分 6分） 解：（1） 2a2b3 ＝ ab 2b．···········································································2分 （2） 200＝10 2．···················································································· 4分 （3 2）－ - ＝－ ．················································································· 6分 20．（本题满分 6分） 1 解：（1） 27－ 12＋ 3 ＝3 3 2 3 3 ··········································································· 1分 3 1 ＝(3－2＋ ) 3 ··············································································2分3 4 3 ＝ ．·······················································································3分 3 （2）(3 6 － 2 2 )÷ 2 ＝3 6 2 2 2 2 ···········································································5分 ＝3 3 2．·························································································6分 21．（本题满分 10分） 解：∵ x 5 1， y 5 1， ∴xy－x2． ＝x(y－x)·····································································································2分 ＝ 5 1 5 1 5 1 ··············································································4分 ＝ 5 1 5 1 5 1 ·················································································· 6分 八年级数学参考答案（第 1页 共 4页） ＝ 2 5 1 ···································································································8分 ＝ 2 5 2．································································································10分 22．（本题满分 10分） 解：（1）由勾股定理得：AB＝ AC 2 BC ... ...