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已知定点A(3,4),点P为抛物线y2=4x上一动点,点P到直线x=-1的距离为...
已知定点A(3,4),点P为抛物线y2=4x上一动点,点P到直线x=-1的距离为d,则|PA|+d的最小值为 .
考点分析:
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执行下边的程序框图,若p=0.8,则输出的n=
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下列结论:①命题“∀x∈R,x
2-x>0”的否定是“∃x∈R,x
2-x≤0”;
②当x∈(1,+∞)时,函数
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的图象都在直线y=x的上方;
③定义在R上的奇函数f(x),满足f(x+2)=-f(x),则f(6)的值为0.
④若函数f(x)=mx
2-2x在区间(2+∞)内是增函数,则实数m的取值范围为
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.
其中,正确结论的个数是( )
A.1
B.2
C.3
D.4
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定义运算:
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,将函数f(x)=
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的图象向左平移t(t>0)个单位,所得图象对应的函数为偶函数,则t的最小值为( )
A.
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B.
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C.
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D.
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