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请写出一个开口向下,且函数有最大值2的二次函数的解析式是 .
请写出一个开口向下,且函数有最大值2的二次函数的解析式是 .
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2+bx+c的图象如图所示,则下列结论:①a<0;②b<0;③c>0;④a+b+c=0;⑤b+2a=0.其中正确的个数是( )
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A.1个
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(m≠0)在同一坐标系内的图象可以是( )
A.
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正比例函数y
1=k
1x和反比例函数y
2=
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的图象都经过点(2,1),则k
1,k
2的值分别为( )
A.k
1=
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,k
2=2
B.k
1=2,k
2=
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,
C.k
1=2,k
2=2
D.k
1=
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,k
2=
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