一元二次方程x2+5x+6=0的根是 .
考点分析:
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当a
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在实数范围内一有意义.
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如图,直线a、b相交,∠1=65°,则∠2的度数是
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如图,点B、C、E在同一条直线上,△ABC与△CDE都是等边三角形,则下列结论不一定成立的是( )
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x
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如图,在平面直角坐标系中,直线y=
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A.6
B.3
C.12
D.
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