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四(1)班共有39名学生,老师要送给每人一个8元钱的文具袋.老师带了400元钱,够吗?
— Attention, please. The plane has to be _________ because of the foggy weather.— Oh, bad luck! We have to wait now.
已知双曲线x24-y216=1的渐近线l1经过二、四象,直线l过点A(2,3)且垂直于直线l1,则直线l方程为( )