1.下列各组单项式中,是同类项的是( )
| A. | 2x3与3x2 | B. | a3与b3 | C. | 2x2y与2xy2 | D. | 23与32 |
18.在-2,+3.5,0,$-\frac{2}{3}$,-0.7,11中,负数有( )
0 279552 279560 279566 279570 279576 279578 279582 279588 279590 279596 279602 279606 279608 279612 279618 279620 279626 279630 279632 279636 279638 279642 279644 279646 279647 279648 279650 279651 279652 279654 279656 279660 279662 279666 279668 279672 279678 279680 279686 279690 279692 279696 279702 279708 279710 279716 279720 279722 279728 279732 279738 279746 366461
| A. | 1个 | B. | 2个 | C. | 3个 | D. | 4个 |