如图是某几何体的三视图及相关数据,则该几何体的侧面积是
.
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如图,已知A、B两点的坐标分别为(2,0)、(0,2),⊙C的圆心坐标为(-1,0),半径为1.若D是⊙C上的一个动点,线段DA与y轴交于点E,则△ABE面积的最小值是( )
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A.2
B.1
C.
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D.
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化简(x-
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)÷(1-
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)的结果是( )
A.
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B.x-1
C.
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D.
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函数
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中自变量x的取值范围是( )
A.x≥-3
B.x≥-3且x≠1
C.x≠1
D.x≠-3且x≠1
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如图,由四个相同的直角三角板拼成的图形,设三角板的直角边分别为a、b(a>b),则这两个图形能验证的式子是( )
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A.(a+b)
2-(a-b)
2=4ab
B.(a
2+b
2)-(a-b)
2=2ab
C.(a+b)
2-2ab=a
2+b
2D.(a+b)(a-b)=a
2-b
2
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如图,修建抽水站时,沿着倾斜角为30°的斜坡铺设管道,若量得水管AB的长度为80米,那么点B离水平面的高度BC的长为( )
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A.
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米
B.40
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米
C.40米
D.10米
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