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已知两圆外切,它们的半径分别为3和8,则这两圆的圆心距d的值是 .
已知两圆外切,它们的半径分别为3和8,则这两圆的圆心距d的值是 .
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如图,正方形ABCD中,E是BC边上一点,以E为圆心、EC为半径的半圆与以A为圆心,AB为半径的圆弧外切,则S
四边形ADCE:S
正方形ABCD的值为( )
A.
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B.
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C.
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D.
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如图,是一次函数y=kx+b与反比例函数y=
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的图象,则关于x的方程kx+b=
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的解为( )
A.x
l=1,x
2=2
B.x
l=-2,x
2=-1
C.x
l=1,x
2=-2
D.x
l=2,x
2=-1
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如图是由几个小立方块所搭成的几何体的俯视图,小正方形中的数字表示在该位置小立方块的个数,则这个几何体的左视图为( )
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A.
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B.
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C.
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D.
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