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已知关于x的一元二次方程(k+1)x
2+2x-1=0有两个不相同的实数根,则k的取值范围是
.
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在方程ax
2+bx+c=0(a≠0)中,若有一根为x=-1,则a-b+c=
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若
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+(y+3)
2=0,则x
y=
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写出一个二次根式,使这个二次根式化成最简二次根式后,与
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的被开方数相同,这个二次根式可以是
(写出满足条件的一个即可).
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如图,电灯P在横杆AB的正上方,AB在灯光下的影长为CD,AB∥CD,AB=2m,CD=5m,点P到CD的距离是3m,则点P到AB的距离是( )
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A.
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m
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m
C.
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m
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m
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