方程x2-2=0的根是 .
考点分析:
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根据右图中已填出的“√”和“×”的排列规律,把②、③、④还原为“√”或“×”且符合右图的排列规律,下面“
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”中还原正确的是( )
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A.
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B.
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C.
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D.
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如图,矩形ABCD中,AB=4,以点B为圆心,BA为半径画弧交BC于点E,以点O为圆心的⊙O与弧AE,边AD,DC都相切.把扇形BAE作一个圆锥的侧面,该圆锥的底面圆恰好是⊙O,则AD的长为( )
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A.4
B.
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C.
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D.5
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已知a是方程x
2+x-1=0的一个根,则
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的值为( )
A.
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B.
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C.-1
D.1
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下列各个选项中的网格都是边长为1的小正方形,利用函数的图象解方程5x-1=2x+5,其中正确的是( )
A.
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B.
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C.
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D.
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