2.在下列整式中,次数为3的单项式是( )
| A. | ab2 | B. | x3-y3 | C. | m3n | D. | 3st |
1.代数式2abc,-3x2+x,-$\frac{3}{x}$,2$\frac{1}{3}$中,单项式的个数是( )
0 282656 282664 282670 282674 282680 282682 282686 282692 282694 282700 282706 282710 282712 282716 282722 282724 282730 282734 282736 282740 282742 282746 282748 282750 282751 282752 282754 282755 282756 282758 282760 282764 282766 282770 282772 282776 282782 282784 282790 282794 282796 282800 282806 282812 282814 282820 282824 282826 282832 282836 282842 282850 366461
| A. | 1个 | B. | 2个 | C. | 3个 | D. | 4个 |