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【简答题】
已知二次函数y=x 2 -mx+m-2． （1）求证：无论m为任何实数，该二次函数的图象与x轴都有两个交点； （2）当该二次函数的图象经过点（3，6）时，求二次函数的解析式； （3）将直线y=x向下平移2个单位长度后与（2）中的抛物线交于A、B两点（点A在点B的左边），一个动点P自A点出发，先到达抛物线的对称轴上的某点E，再到达x轴上的某点F，最后运动到点B．求使点P运动的总路径最短的点E、点F的坐标，并求出这个最短总路径的长．
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【单选题】The question of whether war is inevitable is one which has concerned many of the world's great writers. Before considering this question, it will be useful to introduce some related concepts. Conflict...
A.
like animal fights, competition is a necessity and war is inevitable
B.
competition becomes war when it grows more and more fierce
C.
when social entities serve one another, opposition means cooperation
D.
while competition is unavoidable, war is not a necessary outcome
【简答题】计税依据是指计算应纳税额的依据或标准，即根据什么来计算纳税人应缴纳的税额，也就是纳税的客体。 （ ）
【单选题】The question of whether war is inevitable is one which has concerned many of the world's great writers. Before considering this question, it will be useful to introduce some related concepts. Conflict...
A.
argue for the similarities between animal societies and human societies
B.
smooth out the conflict in human societies
C.
distinguish between two kinds of opposition
D.
summarize the that characteristic feature of opposition and cooperation
【单选题】The question of whether war is inevitable is one which has concerned many of the world's great writers, Before considering this question, it will be useful to introduce some related concepts. Conflict...
A.
argue for the similarities between animal societies and human societies
B.
smooth out the conflicts in human societies
C.
distinguish between two kinds of opposition
D.
summarize the characteristic features of opposition and cooperation
【单选题】The question of whether war is inevitable is one which has concerned many of the world's great writers. Before considering this question, it will be useful to introduce some related concepts. Conflict...
A.
argue fur the similarities between animal societies and human societies
B.
smooth out the conflicts in human societies
C.
distinguish between two kinds of opposition
D.
summarize the characteristic features of opposition and cooperation
【单选题】The question of whether war is inevitable is one which has concerned many of the world's great writers. Before considering the question, it will be useful to introduce some related concepts. Conflict,...
A.
War.
B.
Conflict.
C.
Competition.
D.
Co-operation.
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