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若实数x、y满足4x+4y=2x+1+2y+1,则t=2x+2y的取值范围是( ...
若实数x、y满足4x+4y=2x+1+2y+1,则t=2x+2y的取值范围是( )
A.0<t≤2
B.0<t≤4
C.2<t≤4
D.t≥4
考点分析:
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A.
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D.
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给出下面结论:
①命题p:“∃x∈R,x
2-3x+2≥0”的否定为¬p:“∀x∈R,x
2-3x+2<0”;
②命题:“∀x∈M,P(x)”的否定为:“∃x∈M,P(x)”;
③若¬p是q的必要条件,则p是¬q的充分条件;
④“M>N”是“㏒
aM>㏒
aN”的充分不必要条件.
其中正确结论的个数为( )
A.4
B.3
C.2
D.1
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2项的系数是( )
A.-192
B.192
C.-6
D.6
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已知a是函数
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的零点,若0<x
<a,则f(x
)的值满足( )
A.f(x
)=0
B.f(x
)>0
C.f(x
)<0
D.f(x
)的符号不确定
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