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(2001•内江)解方程组
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(2001•内江)解方程组
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(2001•内江)解方程组
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(2001•内江)已知:a>0,x1,x2是方程ax2+bx+c=0的两根且x1<x2,则的值是( )
A.
B.
C.
D.
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(2001•内江)已知:a>0,x1,x2是方程ax2+bx+c=0的两根且x1<x2,则的值是( )
A.
B.
C.
D.
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(2001•内江)用换元法解方程:x2+2x+1+=3,设y=,则原方程可化为( )
A.y2+3y-1=0
B.y2+3y+1=0
C.y2+y-1=0
D.y2+3y+3=0
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(2001•内江)用换元法解方程:x2+2x+1+=3,设y=,则原方程可化为( )
A.y2+3y-1=0
B.y2+3y+1=0
C.y2+y-1=0
D.y2+3y+3=0
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(2001•内江)一元二次方程4x2-4x+1=0的根的情况是( )
A.只有一个实数根
B.有两个相等的实数根
C.有两个不相等的实数根
D.没有实数根
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(2001•内江)计算:1-a-a(1-a)-a(1-a)2-a(1-a)3-…-a(1-a)2000-[(1-a)2001-3]
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(2001•内江)已知α=70°,则∠α的补角是( )
A.20°
B.30°
C.110°
D.130°
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(2001•内江)已知:如图,AB=AC,BD=CE.
求证:AD=AE.