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1年前
已知点A(1,1)在二次函数y=x2﹣2ax+b图象上. (1)用含a的代数式表示b; (2)如果该二次函数的图象与x轴只有一个交点,求这个二次函数的图象的顶点坐标.
1年前
Telecommuting(远程办公) will have major effects on the worlds of work and family life.
1年前
Mum, do you mind my listening to music for a while?
1年前
As the income is increasing,the________of family life has been changing over recent years. [ ]
1年前