3.从0,π,$\frac{1}{3}$,$\frac{{\sqrt{2}}}{2}$这四个数中随机取出一个数,取出的数是无理数的概率是( )
| A. | $\frac{1}{4}$ | B. | $\frac{3}{4}$ | C. | $\frac{1}{3}$ | D. | $\frac{1}{2}$ |
20.计算x4÷x+x3的结果是( )
0 283931 283939 283945 283949 283955 283957 283961 283967 283969 283975 283981 283985 283987 283991 283997 283999 284005 284009 284011 284015 284017 284021 284023 284025 284026 284027 284029 284030 284031 284033 284035 284039 284041 284045 284047 284051 284057 284059 284065 284069 284071 284075 284081 284087 284089 284095 284099 284101 284107 284111 284117 284125 366461
| A. | x4 | B. | x3 | C. | 2x3 | D. | 2x4 |