分解因式:x3-x= .
考点分析:
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沪杭高速铁路已开工建设,某校研究性学习以此为课题,在研究列车的行驶速度时,得到一个数学问题.如图,若v是关于t的函数,图象为折线O-A-B-C,其中A(t
1,350),B(t
2,350),C(
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,0),四边形OABC的面积为70,则t
2-t
1=( )
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A.
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B.
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C.
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D.
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下列函数:①y=x-1;②y=-3x;③
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;④y=x
2+2x+1,其中y值随着x值的增大而增大的函数有( )
A.①③
B.①④
C.②③
D.③④
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如图,把三角板的直角顶点放在直尺的一边上,∠2=45°,∠3=20°,则∠1=( )
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A.65°
B.105°
C.110°
D.115°
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如图,A、B、C三点在圆O上,AD平分∠BAC,∠DAC=35°,则∠BOC=( )
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A.35°
B.70°
C.120°
D.140°
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如图,数轴上A,B两点表示的数分别为-1和
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,点B关于点A的对称点为C,则点C所表示的数为( )
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A.-2-
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B.-1-
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C.-2+
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D.1+
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