分解因式:ax2-ay2= .
考点分析:
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如图,弧
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是以等边三角形ABC一边AB为半径的四分之一圆周,P为弧
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上任意一点,若AC=5,则四边形ACBP周长的最大值是( )
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A.15
B.20
C.15+
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D.15+
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A(x
1,y
1)、B(x
2,y
2)是一次函数y=kx+2(k>0)图象上不同的两点,若t=(x
1-x
2)(y
1-y
2),则( )
A.t<0
B.t=0
C.t>0
D.t≤0
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如图,⊙O过点B、C.圆心O在等腰直角△ABC的内部,∠BAC=90°,OA=1,BC=6,则⊙O的半径为( )
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A.
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B.2
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C.3
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D.
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在下列四个图案中,既是轴对称图形,又是中心对称图形是( )
A.
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B.
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C.
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D.
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2011年,全国城镇新增就业人数为1221万人,用科学记数法表示1221万正确的是( )
A.1.221×10
8B.1.221×10
7C.12.21×10
6D.12.21×10
5
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