— my ruler?
— It's on the desk.
Tell me and I'll forget. Show me and I not remember. Let me try and I'll understand.
若a∈0,3,b∈0,2,函数fx=x2-2ax+b2有零点的概率为()
经典诵读可以帮助我们提取丰富的历史信息。《三字经》“嬴秦氏,始兼并…迨至隋,一土宇……元灭金,绝宋世.太祖兴,国大明”中所反映的从长期分裂走向统一的朝代有( )