15.如果单项式-xa+1y3与12ybx2是同类项,那么a、b的值分别为( )
| A. | 1,1? | B. | 2,3 | C. | 1,3? | D. | 2,1 |
14.在-(-3),(-2)2,0,-32,-|-3|中,负数的个数有( )
0 282767 282775 282781 282785 282791 282793 282797 282803 282805 282811 282817 282821 282823 282827 282833 282835 282841 282845 282847 282851 282853 282857 282859 282861 282862 282863 282865 282866 282867 282869 282871 282875 282877 282881 282883 282887 282893 282895 282901 282905 282907 282911 282917 282923 282925 282931 282935 282937 282943 282947 282953 282961 366461
| A. | 0个 | B. | 1个 | C. | 2个 | D. | 3个 |