12.当a=-2,b=3,则a2-2b+3的值( )
| A. | -7 | B. | 1 | C. | 4 | D. | 6 |
7.估计$\sqrt{16}$×2-$\sqrt{2}$的运算结果在哪两个相邻的整数之间( )
0 295753 295761 295767 295771 295777 295779 295783 295789 295791 295797 295803 295807 295809 295813 295819 295821 295827 295831 295833 295837 295839 295843 295845 295847 295848 295849 295851 295852 295853 295855 295857 295861 295863 295867 295869 295873 295879 295881 295887 295891 295893 295897 295903 295909 295911 295917 295921 295923 295929 295933 295939 295947 366461
| A. | 4和5 | B. | 5和6 | C. | 6和7 | D. | 7和8 |