【题目】有理数中绝对值最小的数是( )
A.﹣1
B.0
C.1
D.不存在
科目:初中数学 来源: 题型:
【题目】如图,在平面直角坐标系中,AABC的三个顶点坐标为A(一3,4),B(一4,2),C(一2,1),ΔABC绕原点顺时针旋转90°,得到△A1B1C1,ΔA1B1C1向左平移2个单位,再向下平移5个单位得到△A2B2C2.
(1)画出ΔA1B1Cl和△A2B2C2
(2)P(a,b)是AABC的AC边上一点,ΔABC经旋转、平移后点P的对应点分别为P1、P2,请写出点P1、P2的坐标.
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科目:初中数学 来源: 题型:
【题目】如图,正三角形ABC内接于⊙O,P是BC上的一点,且PB<PC,PA交BC于E,点F是PC延长线上的点,CF=PB,AB=,PA=4.
(1)求证:△ABP≌△ACF;
(2)求证:AC2=PAAE;
(3)求PB和PC的长.
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科目:初中数学 来源: 题型:
【题目】电脑键盘上的字母为何不按顺序排列?请你来做一项统计,下面是一篇小短文,根据短文中字母a,b出现的机会完成后面提出的问题:
Two Trips
Jack brought a small plane and began to fly it. He soon became excited and made his plane all kinds of tricks.
Jack had a friend,named Tom. One day Jack said to him,“I will pick you up in my plane.““I will be glad to.'answered Tom. They went up,and Jack flew around for half an hour and did all kinds of tricks in the air. Then they came down. Tom was to be back safely,and said to Jack,“Well,Jack,thank you very much for those two trips in your plane.“Jack was very surprised and asked,“Two trips?““Yes,my first and my last.'an﹣swered Tom.
根据上文填表
出现字母的个数 | 100 | 150 | 200 | 250 | 300 | 350 | 400 |
出现字母a的频数 | |||||||
出现字母a的频率 | |||||||
出现字母b的频数 | |||||||
出现字母b的频率 |
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