Exhausted，covered in mud and desperately hungry，a team of Swedish athletes sat down for a meal as they prepared to take on a dangerous 20-mile trek through the Ecuadorian rainforest． As
In 1971 a young man who grew up very poor was travelling across the country, trying to make a new start for himself. Along the way he had completely run out of money and was forced to spend the night
在[0, 2]上是x的减函数，则实数a的取值范围是______▲______；
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