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{
"source_file": "./raw_volume-zh/volume1/exercise2.tex",
"problem_type": "calculation",
"problem": "问题1 已知集合 $M=\\{2,|a|\\}$ 是全集 $U=\\left\\{2,3, a^2+2 a+2\\right\\}$ 的一个子集, 且 $\\complement_U M=\\{5\\}$, 则实数 $a$ 的值等于",
"solution": "-3 . $|a|=3$, 且 $a^2+2 a+2=5$. 解得 $a=-3$.",
"remark": "",
"figures": []
}