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- 1一根木头,不知它的长度.用一根绳子来量,绳子多1.5米;如果将绳子对折后再来量,又少0.4米.这根绳子长多少米?
- 2已知二次函数f(x)= -x2+2ax+1-a在区间[0,1]上有最小值1/4,求实数a的值
- 3如图所示,在直角坐标系中,矩形ABCD的边AD在x轴上,点A在原点,AB=3,AD=5.若矩形以每秒2个单位长度沿x轴正方向作匀速运动.同时点P从A点出发以每秒1个单位长度沿A-B-C-D的路线作匀速运动
- 4甲、乙两人骑自行车同时从相距65km的两地相向而行,2小时相遇,已知甲比乙每小时多骑2.5km,乙速度是每小
- 5人呼出的气体与空气相比,氮气无变化,而氧气,二氧化碳,水蒸气的变化情况是()
- 6英语翻译
- 7莎士比亚名言To be or not to be,That is a question应该怎么解释
- 8英语 The little girl looks after the baby well.改为同义句
- 9some peoplealways have a stomach ache.because they are too (b )and always (f )首字母填空,帮个忙啊
- 10I cound not take my eyes off the coin changer fixed to his belt求翻译和分析