挑战习题
1/3单选题
难度:

1.在不等式组表示的平面区域上运动,则的取值范围是(  ).
A [-2,-1]
B [-2,1]
C [-1,2]
D [1,2]
提示1:
6ICD6JmRPGltZyB3aWR0aD02MSBoZWlnaHQ9MTggc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8zNy8wRi9yQkFDSmxTMDBlaXlKMVdmQUFBQnhVN1NiSDQxMzcucG5nIj7vvIzmiorlroPlj5jlvaLkuLo8aW1nIHdpZHRoPTYxIGhlaWdodD0xOCBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzM3LzRBL3JCQUNKMVMwMGVqenlhaUJBQUFCelVBNmh4MDc3MS5wbmciPu+8jOi/meaYr+aWnOeOh+S4ujHkuJTpmo88aT56PC9pPuWPmOWMlueahOS4gOaXj+W5s+ihjOebtOe6vw==
提示2:
PGltZyB3aWR0aD0yMiBoZWlnaHQ9MTQgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC82Qi80OC9yQkFDRTFTMDBlaWdJakxXQUFBQThmRkZjRHM0OTUucG5nIj7mmK/nm7Tnur/lnKg8aT55PC9pPui9tOS4iueahOaIqui3ne+8juW9k+ebtOe6v+a7oei2s+e6puadn+adoeS7tuS4lOe7j+i/h+eCue+8iDLvvIww77yJ5pe277yM55uu5qCH5Ye95pWwPGltZyB3aWR0aD02MSBoZWlnaHQ9MTggc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC8zNy8wRi9yQkFDSmxTMDBlaXlKMVdmQUFBQnhVN1NiSDQxMzcucG5nIj7lj5blvpfmnIDlpKflgLzkuLoy
正确答案:Qw==
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