多项式4x3-16x2y+16xy2分解因式的结果是 .
考点分析:
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反比例函数
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(k为常数,k≠0)的图象位于( )
A.第一、二象限
B.第一、三象限
C.第二、四象限
D.第三、四象限
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下列说法中,正确的说法有( )
①对角线互相垂直、平分且相等的四边形是正方形;
②一元二次方程x
2-x-6=0的根是x
1=-3,x
2=-2;
③依次连接任意一个四边形各边中点所得的四边形是平行四边形;
④一元一次不等式2x+5<11的非负整数解有3个;
⑤在数据1,3,3,0,2,4,1;中,平均数是2,中位数是2.
A.1个
B.2个
C.3个
D.4个
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如果∠a是直角三角形的一个锐角,且sinα的值是方程
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的一个根,那么三角形的另一个锐角的度数是( )
A.30°
B.45°
C.60°
D.30°或者60°
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(2007•威海)某种工件是由一个长方体钢块中间钻了一个上下通透的圆孔制作而成,其俯视图如图所示,则此工件的左视图是( )
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A.
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B.
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C.
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D.
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(2009•德州)如图,点A的坐标为(-1,0),点B在直线y=x上运动,当线段AB最短时,点B的坐标为( )
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A.(0,0)
B.(
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,-
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)
C.(-
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D.(-
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)
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