x22x4x的精选

问题详情：下列命题:①x∈R,不等式x2+2x>4x-3成立;②若log2x+logx2≥2,则x>1;③命题“若a>b>0且c<0,则>”的逆否命题;④若命题p:x∈R,x2+1≥1.命题q:x0∈R,-2x0-1≤0,则命题p∧﹁q是真命题.其中真命题有()A.①②③   ...