10.若整数a使关于x的不等式组$\left\{\begin{array}{l}\frac{x+1}{2}≤\frac{2x+5}{6}\\ x-2>a\end{array}$至少有4个整数解,且使关于x的分式方程$\frac{12-ax}{x+2}$=2有整数解,那么所有满足条件的a的和是( )
| A. | -20 | B. | -17 | C. | -14 | D. | -23 |
8.
若关于x的不等式x-m≥-3的解集如图所示,则m等于( )
| A. | 3 | B. | 4 | C. | 5 | D. | 6 |
7.若a>b,则下列不等式中错误的是( )
| A. | -$\frac{a}{7}$<-$\frac{b}{7}$ | B. | -(-a)>-(-b) | C. | a-2>b-2 | D. | -2a+1>-2b+1 |
4.若a+b=-1,则2a+2b+1的值是( )
0 296795 296803 296809 296813 296819 296821 296825 296831 296833 296839 296845 296849 296851 296855 296861 296863 296869 296873 296875 296879 296881 296885 296887 296889 296890 296891 296893 296894 296895 296897 296899 296903 296905 296909 296911 296915 296921 296923 296929 296933 296935 296939 296945 296951 296953 296959 296963 296965 296971 296975 296981 296989 366461
| A. | 0 | B. | -1 | C. | -2 | D. | -3 |