13.下列四个数中最大的是( )
| A. | -2 | B. | 0 | C. | -$\frac{3}{5}$ | D. | 0.7 |
10.说明“如果x<2,那么x2<4”是假命题,可以举一个反例x的值为( )
| A. | -1 | B. | -3 | C. | 0 | D. | 1.5 |
9.下列运算式中,正确的是( )
0 289930 289938 289944 289948 289954 289956 289960 289966 289968 289974 289980 289984 289986 289990 289996 289998 290004 290008 290010 290014 290016 290020 290022 290024 290025 290026 290028 290029 290030 290032 290034 290038 290040 290044 290046 290050 290056 290058 290064 290068 290070 290074 290080 290086 290088 290094 290098 290100 290106 290110 290116 290124 366461
| A. | a2•a3=a6 | B. | (a3)3=a9 | C. | (2a2)2=2a4 | D. | a6÷a3=a2 |