2023北京东直门中学初一(上)期中数学(教师版).pdf
参考答案一、选择题123456789101112CCCADBCDCDBA二、填空题13.714.-x4y15.<<16.-1,817.-218.2,-219.-220.(1)1,2,3,6(2)7三、解答题21.(1)10(2)(3)(4)22.-1623.(1)(2)24.(1)等式的性质2乘法分配律;(2)三移项没变号;(3)25.(1)52;(2)(3)x=-1326.15−17−219−161,24222−=−==−=原式代入可得将原式yxxyyx5x255x2x-32=7+3x==解:11111x-105516-4x121-3x=53-2x−==+−=+xx解:21056412941...
2025-07-21
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