1.
己知一次函数y1=kx+b与y2=x+a的图象如图所示,则下列结论:①k<0;②a>0;③关于x的方程kx+b=x+a的解为x=3;④x>3时,y1<y2.正确的个数是( )
| A. | 1 | B. | 2 | C. | 3 | D. | 4 |
20.已知函数y=(3-m)x+m-1的图象过第一、二、四象限,则m的取值范围是( )
0 284788 284796 284802 284806 284812 284814 284818 284824 284826 284832 284838 284842 284844 284848 284854 284856 284862 284866 284868 284872 284874 284878 284880 284882 284883 284884 284886 284887 284888 284890 284892 284896 284898 284902 284904 284908 284914 284916 284922 284926 284928 284932 284938 284944 284946 284952 284956 284958 284964 284968 284974 284982 366461
| A. | m>3 | B. | m<1 | C. | 不存在 | D. | 1<m<3 |