17.已知实数x,y满足平面区域$D:\left\{\begin{array}{l}x+y-1≥0\\ 2x-y-2≤0\\ x-2y+2≥0\end{array}\right.$,则x2+y2的最大值为( )
A. | $\frac{1}{2}$ | B. | 1 | C. | $2\sqrt{2}$ | D. | 8 |
16.已知命题p:“?x∈R,ex-x-1≤0”,则命题¬p( )
A. | ?x∈R,ex-x-1>0 | B. | ?x∉R,ex-x-1>0 | C. | ?x∈R,ex-x-1≥0 | D. | ?x∈R,ex-x-1>0 |
15.若?x∈[$\frac{1}{4}$,+∞),使得不等式ex<$\frac{x-m}{\sqrt{x}}$成立,则实数m的取值范围是( )
A. | (-∞,-$\frac{1}{2}$${e}^{\frac{1}{4}}$) | B. | ($\frac{1}{4}$-$\frac{1}{2}$${e}^{\frac{1}{4}}$,+∞) | C. | (-∞,$\frac{1}{4}$-$\frac{1}{2}$${e}^{\frac{1}{4}}$) | D. | ($\frac{1}{2}$-$\frac{1}{2}$${e}^{\frac{1}{4}}$,+∞) |
8.已知实数x∈[1,10]执行如图所示的流程图,则输出的x不小于63的概率为( )
0 246895 246903 246909 246913 246919 246921 246925 246931 246933 246939 246945 246949 246951 246955 246961 246963 246969 246973 246975 246979 246981 246985 246987 246989 246990 246991 246993 246994 246995 246997 246999 247003 247005 247009 247011 247015 247021 247023 247029 247033 247035 247039 247045 247051 247053 247059 247063 247065 247071 247075 247081 247089 266669
A. | $\frac{1}{3}$ | B. | $\frac{4}{9}$ | C. | $\frac{2}{5}$ | D. | $\frac{3}{10}$ |