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- 3I want to know what kind of person are you 什么意思?
- 4It was a s___ day last Sunday.
- 5已知方程2x2-3x-5=0的两根是5/2,-1,则二次函数y=2x2-3x-5的图象与x轴的两个交点间
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- 7已知y=f(x)是定义在R上的奇函数,则下列函数中为奇函数的是
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