9.如果把直角三角形的两条直角边长同时扩大到原来的3倍,那么斜边长扩大到原来的( )
| A. | 3倍 | B. | 4倍 | C. | 6倍 | D. | 9倍 |
6.已知直角三角形两边的长为3和4,则第三边的长为( )
| A. | 7 | B. | 5 | C. | 5或$\sqrt{7}$ | D. | 以上都不对 |
4.一个直角三角形一直角边长为6,另一直角边长为8,则斜边长为( )
| A. | 6 | B. | 8 | C. | 2$\sqrt{7}$ | D. | 10 |
1.如果$\left\{\begin{array}{l}{x=-3}\\{y=1}\end{array}\right.$是方程ax+(a-2)y=0的一组解,则a的值( )
0 284870 284878 284884 284888 284894 284896 284900 284906 284908 284914 284920 284924 284926 284930 284936 284938 284944 284948 284950 284954 284956 284960 284962 284964 284965 284966 284968 284969 284970 284972 284974 284978 284980 284984 284986 284990 284996 284998 285004 285008 285010 285014 285020 285026 285028 285034 285038 285040 285046 285050 285056 285064 366461
| A. | 1 | B. | 2 | C. | -1 | D. | -2 |