9.已知三角形三条边分别是1、$\sqrt{3}$、2,则该三角形为( )
| A. | 锐角三角形 | B. | 直角三角形 | C. | 钝角三角形 | D. | 无法确定 |
5.(1)填空
31-30=3(0 )×2
32-31=3(1 )×2
33-32=3(2 )×2
(2)探索(1)中式子的规律,试写出第n个等式,并说明第n个等式成立.
(3)计算:3+32+…+32017.
0 294983 294991 294997 295001 295007 295009 295013 295019 295021 295027 295033 295037 295039 295043 295049 295051 295057 295061 295063 295067 295069 295073 295075 295077 295078 295079 295081 295082 295083 295085 295087 295091 295093 295097 295099 295103 295109 295111 295117 295121 295123 295127 295133 295139 295141 295147 295151 295153 295159 295163 295169 295177 366461
31-30=3(0 )×2
32-31=3(1 )×2
33-32=3(2 )×2
(2)探索(1)中式子的规律,试写出第n个等式,并说明第n个等式成立.
(3)计算:3+32+…+32017.