如图,四边形ABCD中,AB=AC=AD,BC=CD,锐角∠BAC的角平分线AE交BC于点E,AF是CD边上的中线,且PC⊥CD与AE交于点P,QC⊥BC与AF交于点Q.求证:四边形APCQ是菱形.
考点分析:
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先化简:
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,并从0,-1,2中选一个合适的数作为a的值代入求值.
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计算:(π-2009)
+
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+|
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|+(
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)
-1.
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如图,直线y=-
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x+2与x轴交于C,与y轴交于D,以CD为边作矩形CDAB,点A在x轴上,双曲线y=
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(k<0)经过点B与直线CD交于E,EM⊥x轴于M,则S
四边形BEMC=
.
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已知⊙O
1与⊙O
2两圆内含,O
1O
2=3,⊙O
1的半径为5,那么⊙O
2的半径r的取值范围是
.
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如图,直线y=kx+b经过A(2,1),B(-1,-2)两点,则不等式
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x>kx+b>-2的解集为
.
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