5.下列不等式中,正确的是( )
| A. | m与4的差是负数,可表示为m-4<0 | B. | x不大于3可表示为x<3 | ||
| C. | a是负数可表示为a>0 | D. | x与2的和是非负数可表示为x+2>0 |
19.如果方程2xm-1-3y2m+n=1是关于x、y的二元一次方程,那么m、n的值分别为( )
0 284587 284595 284601 284605 284611 284613 284617 284623 284625 284631 284637 284641 284643 284647 284653 284655 284661 284665 284667 284671 284673 284677 284679 284681 284682 284683 284685 284686 284687 284689 284691 284695 284697 284701 284703 284707 284713 284715 284721 284725 284727 284731 284737 284743 284745 284751 284755 284757 284763 284767 284773 284781 366461
| A. | 1,0 | B. | 2,-3 | C. | 1,-3 | D. | 1,1 |