【題目】有理數(shù)中絕對值最小的數(shù)是( )
A.﹣1
B.0
C.1
D.不存在
科目:初中數(shù)學 來源: 題型:
【題目】如圖,已知OM平分∠AOC,ON平分∠BOC,∠AOB=90°,∠BOC=30°. 求:
(1)∠AOC的度數(shù);
(2)∠MON的度數(shù).
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科目:初中數(shù)學 來源: 題型:
【題目】如圖,在平面直角坐標系中,AABC的三個頂點坐標為A(一3,4),B(一4,2),C(一2,1),ΔABC繞原點順時針旋轉90°,得到△A1B1C1,ΔA1B1C1向左平移2個單位,再向下平移5個單位得到△A2B2C2.
(1)畫出ΔA1B1Cl和△A2B2C2
(2)P(a,b)是AABC的AC邊上一點,ΔABC經(jīng)旋轉、平移后點P的對應點分別為P1、P2,請寫出點P1、P2的坐標.
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科目:初中數(shù)學 來源: 題型:
【題目】如圖,正三角形ABC內(nèi)接于⊙O,P是BC上的一點,且PB<PC,PA交BC于E,點F是PC延長線上的點,CF=PB,AB=,PA=4.
(1)求證:△ABP≌△ACF;
(2)求證:AC2=PAAE;
(3)求PB和PC的長.
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科目:初中數(shù)學 來源: 題型:
【題目】電腦鍵盤上的字母為何不按順序排列?請你來做一項統(tǒng)計,下面是一篇小短文,根據(jù)短文中字母a,b出現(xiàn)的機會完成后面提出的問題:
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.
根據(jù)上文填表
出現(xiàn)字母的個數(shù) | 100 | 150 | 200 | 250 | 300 | 350 | 400 |
出現(xiàn)字母a的頻數(shù) | |||||||
出現(xiàn)字母a的頻率 | |||||||
出現(xiàn)字母b的頻數(shù) | |||||||
出現(xiàn)字母b的頻率 |
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