_____LiJun is only 10, _____ she has taken care of her sick father for three years.
判断对错.
整数都可以看成分母是1的假分数.
小明要把一篇24 000字的社会调查报告录入电脑.完成录入的时间t(分)与录入文字的速度v(字/分)的函数关系可以表示为____ .