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,1)，Q在y轴上，若直线PQ的倾斜角为120°，则Q点坐标为______________.
C.3 D.
|≤
与x2-3(a+1)x+2(3a+1)≤0(a∈R)的解集依次为A已知关于x的实系数二次方程x2+ax+b=0有两个实根α、β,证明结果|α|＜2,|β|＜2,那么2|a|＜4+b且|b|＜4.
|≤
与x2-3(a+1)x+2(3a+1)≤0(a∈R)的解集依次为A与B,求使A
B的a的取值范围.
)(1+
)≥9.
则不等式x+(x+2)·f(x+2)≤5的解集是__________.