共50条信息
证明下列不等式:
\((1)\)当\(a > 2 \)时,求证:\( \sqrt{a+2}+ \sqrt{a-2} < 2 \sqrt{a} \);
\((2)\)设\(a > 0\),\(b > 0\),若\(a+b-ab=0 \),求证:\(a+b⩾4 \).
已知函数\(f\left(x\right)=a{x}^{2}-{e}^{x}\left(a∈R\right) \)在\(\left(0,+∞\right) \)上有两个零点为\(x_{1}.x_{2}(x_{1} < x_{2})\)
\((1)\)求实数\(a\)的取值范围
\((2)\)求证\(x_{1}+x_{2} > 4\)
进入组卷