9.直接写得数.
| 5.8-4= | 3.8+0.12= | 3.1×0.03= | 0.25+0.75= |
| 2.1-2.01= | 8-2.5= | 1.01×3.7= | 1.4×2.5×4= |
| 0.4+0.6= | 1.25×8= | (0.5+0.25)×4= | 0.8×5×6= |
8.下列每组小棒中能组成三角形的一组是( )
| A. | 3cm 9cm 5cm | B. | 7cm 4cm 10cm | ||
| C. | 5cm 5cm 11cm | D. | 4cm 2cm 2cm |
7.比x的6倍少12的数是( )
| A. | 12-6x | B. | 6x-12 | C. | 6x+12 |
6.下面等式是方程的是( )
0 157767 157775 157781 157785 157791 157793 157797 157803 157805 157811 157817 157821 157823 157827 157833 157835 157841 157845 157847 157851 157853 157857 157859 157861 157862 157863 157865 157866 157867 157869 157871 157875 157877 157881 157883 157887 157893 157895 157901 157905 157907 157911 157917 157923 157925 157931 157935 157937 157943 157947 157953 157961 199269
| A. | 7x+8 | B. | 4.6+5.4=10 | C. | 3x=0 |